while you devs are thinking about splitting space and ground skills to stop people from just skilling space due to pvp intentions you should also think about splitting inventories up:
One Inventory for space related items and one for ground related items. You could then slightly decrease inventory size to compensate.
Adding special inventories would be a nice special reward / c-store item to further increase your inventory space:
You could then add a weapon rack mini inventory for storing ground weapons (maybe on a bank), to give just one possible example.