I thought of something else as well while playing the same character.
If we had an easier way of watching our buffs without having to have the whole team buffs UI out covering half the screen, as well as maybe a timer showing exactly how long they have left on them instead of only alerting you when they're almost gone, it would be really helpful as well.
Virtue
The last time they tried an "overwrite" with buffs, they had an issue with the buffs ceasing for a moment - but with shields it might not be that noticeable (was with mez protections previously). However, while shields don't stack from the same caster, they should currently overlap as I recall.
The other thing your asking for is a "Show buffs from only me" option. Yes, many of us want it 
Orc&Pie No.53230 There is an orc, and somehow, he got a pie. And you are hungry.
www.repeat-offenders.net
Negaduck: I see you found the crumb. I knew you'd never notice the huge flag.
Copied from elsewhere, finding it helpful -
/optionset buffsettings 2110240
add up all the options you want and use that with /optionset Buffsettings command.
Code:
1 status window hide auto
2 status window hide toggles
4 status window no blinking
8 status window no stacking
16 status window numeric stacking
32 status hide buff numbers
64 status stop sending buffs
128 --
256 group window hide auto
512 group window hide toggles?
1024 group window no blinking
2048 group window no stacking
4096 group window numeric stacking
8192 group window hide buff numbers
16384 group window stop sending buffs
32768 --
65536 pet window hide auto
131072 pet window hide toggles?
262144 pet window no blink
524288 pet window no stacking
1048576 pet window numeric stacking
2097152 pet window hide buff numbers
4194304 pet window stop sending buffs
I don't really know where to post this as it's more of a suggestion than a question I guess.
I've been playing my thermal defender a lot lately so I've been noticing this quite a bit. Basically my problem is that when you cast a buff on a player that already has one from you, it will not do anything. The buff will still expire after the allotted time from the original cast and your energy will be wasted. Don't get me wrong, I love love love the AoE effects for shields now, it's just a huge quality of life improvement. I feel we can do even better though.
Right now if I hit a couple people with my shields, and someone enters the mission a minute or two later and I hit them, even if the original targets are still in range, the shields will wear off at different times. Then my choices are re-shielding the original targets, continuing the out of sync times, or wait until everyone's shields run out and hope I can get them all at once.
The shields aren't even that much of a problem though as they can be recast pretty much instantly. Something like Forge (Or Fortitude... etc.) with a bit longer cooldown is much more frustrating. If I'm on a small team, or really want to only give it to a couple specific people, I have to wait until it wears off or it's wasted and I have to wait it's entire cooldown before I can use it again. Also likely to happen is that it will wear off of at least someone in that time and thus, however little, team performance is lessened for the moment.
I would really, really, really like it if buffs would overwrite same-buffs already on a target that you yourself have put on them. The system as it is now is a bit archaic to say the least, no offense meant to the wonderful designers and programmers who make this great game, but I feel this change as small as it is would be another step on the QoL ladder.
Another smaller request would be to increase the AoE on shields (And other similar newly-AoE buffs). 30m really isn't that big, and I've really been noticing that, too, when my team is fighting in a small-ish room and I shield the guy in the middle and still miss some people who really didn't seem that far away. Anyway, this is even less of a problem (Due to shields being near instant re-castable as mentioned), but it would still be another improvement of convenience and general quality of life for those of us with shields.
Thank you.
Virtue