This idea is actually good.
It's beneficial for majority of Graal if you actually think about it.
For idolers who's 99% in a non-pk area, their sword slot becomes invisible and a waste of a slot when it can be used for other items they want to use therefore not being limited to just 2 slots.
For tower takers, glove isn't necessary (unless you need to throw bombs). Other than that it's pointless so why not use the glove slot for something more important such as a mount to get from tower to tower.
For sparrers, gloves has no need in this field (unless they really like hugging people). If they re-enable item buttons to appear in spar rooms, then i could make a case for this, but as of now, I can't.
For eventers, gloves isn't needed when looking for the event door. So why not put the slot into good use. Their 4 main slots would be a mount, lanturn, rat, and sword(in case a mass PK feast.). Railroad would be one once its up though.
For PKers, same concept as tower takers but I guess it's not as beneftable for them unless they like to use any items they personally need/like.
For BKers, they can have all four slots be a mount, bombs, arrows, and sword for a full combat against the baddies at York Town. Glove is practically pointless in this field.
You can always change back to the glove and sword in a few seconds anyways, so there's no problems with this idea.