IWD II - Removing the summoning limit

I apologize if there's a similar question elsewhere, but I simply haven't found one.

Does anyone know if there's a way to remove the summoning limit / cap in Icewind Dale II?

I've been using Near Infinity to examine the summon spells. The spells simply refer to standard Creature (.CRE) resources, so I think the cap might lie with the spells (.SPLs) themselves. However, I've been unable to find out which parameters to edit.

I know that Baldur's Gate I had no summon limit, and with Baldur's Gate II you simply had to alter the CREs gender from SUMMONED. But with Icewind Dale, I'm stumped!

Any help will be extremely welcome!