With just the in-game options, not entirely... however you can setup some keybinds to help with that.
Have a look here:
http://boards.cityofheroes.com/showflat....=3#Post10159414
(scroll down to "Popular and Useful Binds")
If you happen to own a G15 keyboard or something similar, you can achieve a higher level of automation, but it can be a bit unreliable because of variable recharge times and such...
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Hi
First time posting, so apologies if this is in the wrong place.
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It's certainly one of the many suitable places for a question like this, and welcome to the forums! 
I've never been able to find a bind to buff an entire team in one click/button. I think this is because after the 2nd or third target change/application, everything goes to pot
I've not looked at the link from the poster above, but setting say:
/bind 1 pow_exec_name Ice Shield
and then having the toggle teammates bind (bit sketchy on this, something like cycle_custom_teammate, or something similar?) and then simply pressing your cycle key, then 1, on loop, can be *Much* less frustrating than click buffing from the team window and the power tray.
Just my opinion, s'how i deal with bubbling 8 man teams twice over without wanting to drown myself in a vat of tar
Hi
First time posting, so apologies if this is in the wrong place.
I'm sure I am just being a bit thick, but is there a way to set up a bind enabling me to 'Buff' the whole team without having to click on the individual Toon, then click the power etc etc
Thanks for any help on this