Is there a way to add mobs from other mods into woot?
that would be super useful!

The way that Woot works is that is automatically learns the drops from any mod that is installed.
There are exceptions when I have blacklisted specific mods or mobs for reasons of balance or out of respect for other mod authors progressions.

Is there some specific mob that is not working for you?

Woow what a fast response time first of all!
And not really, i wanted to know in case i make a modpack and want to disable/change mob drops to not make stuff too easy

I kinda wrote the question wrong....

You cannot change mob drops but you can blacklist items from being produced.
ie. stop nether stars from being dropped by and mobs from the factory.