I think the sin aspects should be more double edged.
Gula should periodically randomly feed or starve you by 2 hunger points (can be weighted more towards starve for balance).
Luxuria should have a chance of makeing the breedable mob go in to a frenzy and "attack" you.
Infernus should randomly either buff you with a 10 second lvl 1 flame shield and or set you on fire.
Ira should be similar to infernus but with lvl 1 strength but hurt you one heart instead of fire.
Desidia should slow down your hunger but at the expense of a small but sizeable chunk of exp.
Invidia should periodically make you drop the item you are equipped with and act as a magnet.
Superbia should give you defense at the expense of exp and or hunger.
That beign said I'm not sure if Mafia should spread himself too thin by dabbling in Thaumcraft addons aspects.
Gula, I feel like feeding you is overpowered and fames does the other effect so I think that Gula being Indulgence and Gluttony I'd assume it would eat anything.
Luxuria, If anything that should just be tacked on because that's less useful and has less use in general.
Infernus, That would be useful however not alot of use for Automation or otherwise; I feel like my suggestion would be more useful in the long run.
Ira, Again just like Infernus my idea is more useful in the long run.
Desidia, I do not understand how that relates to Sloth in any way shape or form. Mine also has more all though negligible usability.
Invidia, I like that idea personally; I think it should also do that to mobs who hold things as well (Huminoids and Endermen).
Superbia, I don't like this too much, Maybe buff it more so your Invulnerable while standing on it?
I feel like this would be extra. When he gets around to it he could do these but he doesn't have to do them now or even RIGHT after the base aspects; It's up to him when or if to do them but I think cross mod compatibility is partly what Modded Minecraft is about so I don't think this would be turned down... hopefully.