Heretic actor stats for ZDoom Decorate

I've been messing around with Heretic and ZDoom features a bit, and started making a decorate lump with some altered creatures, but it would help if there was a list somewhere of what the attributes of the various creatures & projectiles are so I can modify stuff in relation to that... does such an info sheet exist somewhere, or will I have to muck through the code or something?

The best source for information is indeed the source code. If you refer to older tables you miss some ZDoom specific flags that replace hard coded behabvior from the original. This is quite common with ZDoom.