finer control in modeldef

[CBM]

Id love it if modeldef got more control over the models... Ie

Scalling and setting each part in multiple objects/ models individually

A modelset type feature... Ie a way to select what map(s)
and what spawn id (incl standard doom2 monsters)
That models(s) and actor(s) are being used in

Ie. The ability to have several monster packs and decide when each pack is
relevant based on a map list