@Robert Morse, what if clients are long but leveraged? So... long 400 stocks @100 with 30k capital... they would be subject to IB's margin rules. Same would go with a long call or put spread...
Maybe OP has more positions which are leveraged/over own capital... so a long call spread is bought on margin and needs to adhere to those rules.
During GFC I was long

stocks incl AMBAC... and short some options... (again

) then margin on the options wasn't covered anymore due to the floor collapsing and IB was liquidating some AMBAC (which ended up being a good thing since it dropped way beyond what the liquidation level was).
Not saying that IB's margin rules make total sense... they don't...