Not really. You can start a new thread in the suggestions forum though:
http://boards.cityofheroes.com/forumdisplay.php?f=603
Depending on what your idea is you might want to do a search. New AT threads come up every so often and the more practical ones (Assault/Armor, Blast/Armor and Pet/Blast) have been discussed quite a bit before now.
Thank you.
Is there any thread that is devoted to new AT ideas? If so please let me know where and what it is so that I can throw an idea that way.