How about this as an idea to offet
the amount of time it would take
foot soldiers to move:
Much like CVs, have the option
of larger infantry formations (probably maximum of company size, given the size of the maps and players). The movement of these could
be planned much like CVs are now. Players would then have the option of commanding a squad within that unit, at any point, much like commanding an AA gun on a CV.
You could have various types of infantry, all starting with a historical mix of weapons and vehicles, etc.
What would still need to be addressed
is the fact that the front could move
quite a bit in the time it would take
a 'infantry company convoy' to move at 5mph. Perhaps an 'infantry truck convoy' could
spawn one or more infantry companies,
thus speeding movement.
The ultimate would still be the paratroop drop.
The other option to slow down front
movement would be making it take
a platoon's worth of paras to take
out a field, rather than just a squad.
Denuding fields to reduce air cover,
rather than capturing them,
would allow the ordinary infantry
companies to progress to the field,
with an infantry company being a
good way to actually take a field.
It would slow down front line movement
a lot, though, but might require
more planning - e.g. do you send
your infantry in to deal with them,
tanks, try to see if you can shell
them with a force of destroyers
at some point, send in planes to
take out their infantry?