Let admins add external models to game to block/add jumps...

[m4son]

Adding custom model into a map with q2pro/r1q2 overrides/ent file.

an example to load extra model to a map from .ent file

{
"origin" "-312 -368 -32"
"model" "models/mapmodels/gx/grass1/tris.md2"
"angle" "90"
"classname" "misc_md2"
}

model_spawn entity from kmquake2 -> https://github.com/mczero80/KMQuake2/search?q=SP_model_spawn misc_md2 from dday -> https://github.com/InFerYes/dday/blob/f89f2b26c26708e7f12865f820a0801fb49034bf/g_misc.c#L1655

This could give admins an option to fix some maps to block access to unwanted locations or add new path... like in CTF

q2jump has an option to add invisible boxes to block paths -> https://bitbucket.org/maxwagner65/q2jump/src/master/src/

To make it solid or invisible we could use spawnflags