FE v0.86 Suggestion - unit stacks

I noticed the max number of units I can have defend a city for example is 9.  Can this please be expanded?  Even if I can only attack with 9 max if I can defend or the AI defend with maybe up to 27 that would make taking a city much harder.

I can typically kill 4-6 units in the first series of attack this would allow  defenders to counter and make perhaps sieges a little longer and more fun.  Also I'd think a little longer too if I new there was more units defending than attacking in combat.

This also would correct the issue of... I attack a city, and after the first 9 are killed (+ city defenders that are mostly useless units, would be really nice if they had some kind of average weapon and armour from the selection available...???) I own the city and the remainder of units (usually damaged heroes) are stacked in the city for me to kill separately.