The aspect I appreciate about AH is it's focus upon vehicles/aircraft/boats etc. adding infantry would (IMO) only be beneficial if it was AI orientated a bit like our capture troops are now.
E.g
HTC could add AI sappers that could be released from our m3's and targetted at stuff. ( look thru binoculars and "fire" the sappers at the selected target) 3 teams of 2 per M3
HTC could add AI mortar teams that could be set from our m3's and targetted at stuff. ( look thru binoculars and "fire" the mortar barrage at the selected target) 3 teams of 2 per M3
HTC could add AI guards (with .303's and # rounds) that could be left in place ( much as we drop supplies now) they fire at any enemy passing within range. 10 per M3
HTC could add AI mg teams (with .303 mg's and # rounds) that could be left in place ( much as we drop supplies now) they fire at any enemy passing within range. 2 teams of 2 per M3.
Each player is allowed one set of infantry in the field at a time.
Some gameplay re balancing may be required around town capture conditions.