Pfft you wouldn't want to join that server, it starts to choke if more than 12-15 people get on 
Of course the upside is that I personally think the mod is tons of fun with just 12 people, and I think I might actually like playing with that many players more than a full server. Good ol' MW slugfest brawls make even 1v1 fun.
I'll have to ask my Server Admin, how many Player-Slots my Server has.
12/12 means Company Sized Fights. 16/16 means Company plus Command Lance.
8 would be one lance against another.
Everything in between would be kinda awkward in regards to IS Unit-Structure.
10 could be done for Clan-Battles of one Star against another.
And if there are more than two factions on the field one can work those numbers.
But with 2 Clans you would need 64 Slots to field a Trinary each. Mech-Trinaries.
With low Number of Slots, Elemental Battles would be . . difficult at best.