[Johnny got his gun]

Sorry I'm not into NS but if AMX can do it I'm sure we can do it as well. Not like we're working on different HL engines here. ;-)

You could try hooking a few function calls using the fakemeta module, like setmodel or other that are called at/before precache time, to see if you need to precache these models.

A very hacky solution could be to use the c-style file functions to read through the whole map file in plugin_precache to see how many times "commchair" occurs, that should be the number of entities used.

Btw why not write like this:

check_cc_num() {
    new entity = 0, commchairs = 0
    while ((entity = find_ent_by_class(entity, "team_command")))
        commchairs++
    
    return commchairs
}