Update to the latest build from here:
http://filebase.bots-united.com/inde...category&id=46
then find this setting in the new podbot.cfg file:
# Set this to 1 to switch on the round restart
# after the first human joins the server
# (when bots are playing there in 2 teams)
pb_firsthumanrestart 0
0 - prevents to restart the server, 1 - forces the round restart. But it works in the latest build (not V3B21).