1st suggestion adding a command that will cause players not to pick the same map every 2 maps because the same cs_max and de_dust maps are getting picked every single time. 2nd suggestion is adding more maps because atm there are only 10-12 maps in the server that don't get played.
dd2 max assault italy and dd are the standart maps for SWARM, but I agree it needs to change into something new but the problem is alot of OG 1.6 maps are pretty big and basically roaming around camping simulator type thing.