I'm not sure it's really revelant, I mean:
I place an strategic objective on a crossroad/bridge, how could it be possible that my warlord titan that is standing right on the crossroad/bridge could not be holding this objective ?
I have already thought about adding some restrictions on objective capture:
- objectives in a cover could not be contested by a unit that could not enter the cover unless there's no enemy troops unit inside cover.
- if an objective in a clear area is contested, unit with higher pinning class win the objective. Obviously, how could a gretchin stand contest an objective to a Leviathan ?
Those are just few ideas that would need to be developed but I'm quite sure you see what I mean