Adding a monster to the source in WHAM is a little more complex than just adding monster names since those only work under certain paths. Changing the source for SmartStasis isn't a great idea either since only the defaults are there. Once the zlib variable is set, the defaults become irrelevant.
You need to change the zlib variable with the zlib command. (Not a native mafia command, but it will work that way.)
In the CLI type "zlib banish" and you'll get some more information, like this:
So follow those instructions, adding your monster to a comma separated list.
> zlib banish
Copy/paste/modify/enter any of the following lines in the CLI to edit settings:
zlib BatMan_banish = senile lihc, slick lihc, A.M.C. gremlin
(If no values were shown, no settings or values matched your input text. Type "zlib vars" to see all.)