My suggestion is to allow edit-able tags for procedurally generated creatures, or
clowns
(and I hope my context clues are correct about using that terminology)
.
I think things such as forgotten beasts, titans, demons, etc. should be able to have their tags able to be changed. I've found that breaking the tags after generating an uncompressed world every time (and only sometimes working) can be loathe-some. I think there should be some way to edit them, whether that be editing the default tags they spawn with naturally in-game or somehow making their generation not hard-coded (which would also allow their tags to be edited).
As customize-able as this game is, I don't think it would hurt to implement this. I've seen this subject a moderate amount of times when I've searched for the subject (and ways to more easily edit the tags). The purpose of editing their default tags would be to turn off or remove certain abilities that they always spawn with. People would mostly use this implementation for disabling their [TRAPAVOID], building destroyer, or [NOSTUN] tags. However, just because most people would alter those tags does not mean they are the only application for this. Other uses could be modifying their compositions and special attacks (for more or toned down fun), or other things that a user would want to change about a forgotten beast (this could also add many more possibilities for modding).
I searched for about an hour looking for a similar thread, but alas, nothing as well as, what I believe to be, reasoned out.