[KWo]

Originally Posted by csdm.cfg [settings] ;Sets whether the bomb is removed remove_bomb = 1 [misc] ;Map objectives are removed by their flags. ; a - as_ maps ; b - buyzones are removed ; c - cs_ maps ; d - de_ maps remove_objectives = abcd

Bombs and all objectivities have to be removed to have the round neverending.
To skip the mp_timelimit problem, You should use - whenever You are using CSDM enabled - mp_maxrounds system instead mp_timelimit, I mean - for those maps You should have:
mp_timelimit 0
mp_maxrounds 30
As You can see - if the round is neverending - mp_maxrounds never can be reached...