Guard/AttackMove order inconsistencies with non-autotargeting units

[abcdefg30]

Units that only have Guard or AttackMove but not AutoTarget cannot activate their OrderGenerator when solely selected. They can only enter a Guard or AttackMove activity when ordered in a selection together with at least one unit that has both Guard/AttackMove and AutoTarget.
Example: Engineer in RA cannot guard when selected single, but can guard when selected together with a rifle man.
One way to handle this would be giving meaning to Guard/AttackMove for non-autotargeting units (#18004, and AttackMove turning completely into a regular move). Another option would be to completely skip those units when ordering a guard or attack move. (Like buildings are skipped when you order a move command.)

[KOYK]

Maybe skip the guard command by default when in groups and only use it with the combination of ALT key? And when the unit is selected alone then use it any way, without ALT key.