Currently, if you want to stop firing a weapon during ranged or melee rounds, you just remove it.
Wouldn't it be fun to be able to set a minion's or a familiar's DD spell so it fires only during ranged rounds and/or only during melee rounds?
Issue #1: Mages would be able to equip a weapon with MM.
Solution: Do not allow mages to use melee weapons. For spells that can fire during ranged, also disallow use of ranged weapons.
Issue #2: FB could be turned off during melee rounds, thus allowing mages to deal lots of damage during ranged combat and none during melee.
Solution: Not sure how to work around this one. Maybe keep the friendly fire going during first few rounds of melee to simulate some sort of cool down period.