Mangonel secondary attack mode

Hello, this is just a raw idea. What if Mangonel-line would have a secondary attack mode that bassicaly mimics the pack/unpack mehanic from trebuchet?
Packed, would be the nowadyas mangonel.
Unpacked is a stationary version that gain +1 range and damage. Same RoF.
Could be accompanied with TCs rang beneits from BS upgrades (like any other building)?