Seany007.
Why disable behavior shield in Avast! ?
As you can see in Asyn, Mchain, True Indian and my sig all use Comodo and I know Speedy used to also. No conflicts have been reported yet. Now there is a discussion if Avast! behavior shield is really doing his job or not, and that is another matter completely different. Just set it in " Ask " for more control and chaty, or leave it in " Auto-decide " for a more silent Shield.
Regards.