do setinvisibletoplayer is just for triggers or it can make models, fx invisible to other players too? o.O

I know it works for models and brushmodels, not sure about FX but probably not.

not exactly.. I figured out there's a command that lists all entities so Ill just have to see what adding and not deleting entities.

What command lists all of the entities?, this may prove useful to me.

How did you make it so PhD Flopper dosen't have the red damage indicator in the UGX mod 1.1 (A bit off topic, I know, but we are talking about BO perks)