Here's my new syntax:
dont delete and dont overwrite pref-server-catdamage = 100
datablock bullet morecats looks like catbulletsmall.dts does pref-server-catdamage/2 damage and bounces
datablock bullet cat looks like catbullet.dts does pref-server-catdamage damage instantly hits and explodes into morecats
datablock weapon cat-gun that shoots cat projectiles looks like cat.dts and shoots like the default gun
save pref-server-catdamage