1) Probably a bug, thought we had caught all of those
2) Reserve units have lower max strength and org than regular units, but are free to move anywhere. Once war is declared or you mobilise these restrictions are lifted.
3) each HQ gives a different type of bonus to units in range, i belive it is reinforce chance for a corps HQs
4) Strategic redepolyment uses additional supplies. So if you upgrade infrastructure you can move more
2) Reserve units have lower max strength and org than regular units, but are free to move anywhere. Once war is declared or you mobilise these restrictions are lifted.
3) each HQ gives a different type of bonus to units in range, i belive it is reinforce chance for a corps HQs
4) Strategic redepolyment uses additional supplies. So if you upgrade infrastructure you can move more