hhhmmmmmmm
My main problem with the time constraint is for example the first mission of the campaign.
Personally the way I like to play is setup my units cafefully, move out and start clearing with each unit covering each other, slow and steady to minimize casualty's, as most times if you burn in with a squad in a stryker more times than not a good RPG hit takes it all out, or suppresive machingun fire pins your men and ends up wiping them out, for me i like to plan carefully then move in clearing areas and suppressing others, unfortunatly this takes alot of time, especially when half way through you get re-enforced, u then need to take time to position new units in the field.
I don't see the harm in allowing an option for time limit on/off.
my thoughts