You need a paklist file for any mod you want to play. If you are running more than one mod at the same time, just put each one on a seperate line :
speed=1750
bor.pak=Beats of Rage
bor2.pak=X Men
bor3.pak=Another Game
<<<<<<< Make sure there is a blank line here by adding a CR in the line above
Regards,
The Juggler
Out of interest, this is all explained in the Beta Testing forum B)