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While macros are an aid to role-playing they are not telling enough if the person actually role-plays. The person behind the controls may just like saying that, not realizing what rp really is.
My suggestions to RP is simple:
1) Create a backstory.
2) Stay in-character.
While this may not seem like alot, it is. #1 is essential. A backstory can tell the user how to role-play the character. What personality does the character have? What events led him/her/it (here on out I will use the generic male term) to live the way he does? What tragic events may have shaped his life? All these come together to help the user (help, as the backstory is just that, a BACK-story. Events and actions in game can drastically change how the character is (this is just the beginning... which leads me to the next point...).
STAY IN-CHARACTER. This is the most telling way to show role-play. Sometimes, this isn't enough. You get into a group filled with d00ds, and it maybe impossible to do so. But the more one tries, the more one gets out of it. Rule of thumb, always stay in-character in local chat. While group chat may be tough, local chat should more reflect yourself.
In closing, if you are a roleplayer let other people know. I use a... <( RP )> ... at the end of my bio. My ooc-markers are <( )> and the RP lets people know I am a role-player. When times are tough and the group is bad, this can tell others who usually are the role-player, and if you enjoy their company in a group why not contact them later in a more in-character sense?
Anyhow, these are my suggestions. As my character would probably say after suggesting something... "Take it or leave it."
~ X
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My personal choice of macros involves my character talking to his targeting drone 'Widge'. I have it cycling through about 20 different brief conversations every time I pull him out or put him back into the utility belt. I hope it doesn't annoy anyone too much, but I haven't gotten any complaints yet 
Currently I'm adding a bunch of conversations to cycle through while I'm on the move and he happens to be out, but I'll probably use those more rarely. It's fun, but I have to keep myself in check lest I give in to the desire to become a Minsc/Boo ripoff. (Which is especially tempting given Widge is armed with laser pointers 
) "Go for the eyes Widge! GO FOR THE EYES! RAWWRR!" 
I've been playing RPGs for more than two decades. I enjoy the creation and development of an alternate "me", what can I say?
While I know that RP is not everyone's cup of joe, I would like to pass on a few tips that will make play more fun for you and the others around you.
First off, decide your character's backstory. It is easier if you do this before your character is put together, because you can then make costume choices based on the character's history. I did this with Sistah Soul, a character right out of the "blacksploitation" genre of the 1970's. She used to be a "Mod Squad" type of private investigator until a time warp carried her from Detroit, 1974 to Paragon City, 2004. With this in mind, I created Sistah Soul, a female Natural Scrapper with a mini-skirt, platform boots, granny glasses and a big afro hairstyle. You can also create the backstory to fit the character. Another of my characters is a small guy in blue jeans and a cowboy hat, a Mutant Defender who shoots electricity. After playing him a few levels, I decided that The Li'l Wranger was created when he was struck by lighting while repairing a barbed wire fence on the back 40 in rural Oklahoma.
After you have your backstory comes the real fun: macros. Take one of your tool bars and create some local text macros that reflect your character's personality. Basic ones you will want include asking other players for help while you are in combat, thanking them for help, turning down offered help and offering them help. If Li'l Wrangler is in over her head, I can quickly have him say, "I shore could use some help with this here varmit." If someone asks and Sistah Soul doesn't need any assistance, she can reply, "Thanks, sugar, but I'm TOO much woman for this dude! I'll manage." Roleplay and convenience, all in one mouse click.
Another way to add flavor is to create "flavor" text macros. After defeating a tough enemy, Sistah Soul likes to say, "Maybe now, you'll show a lady some RESPECT!" Another character, Santy Claws (Magic Scrapper using guess what weapon), chases down villains while saying, "Running won't do you any good, Douglas Arthur Johnston! I know where you live!" Li'l Wrangler sometimes tells a grateful public, "Shucks, t'warn't nuthin." It can be fun to have things to throw out during a fight, like, "Someone has been a *very* naughty boy this year!"
Make your text meaningful and easy to interpret, but make it fit your character. Again, it can be helpful to have things like this done and available so you don't have to hunt through the quick menu or type while you are busy fighting. It's an easy way to add some character to your character.