First of all....Space Tag and Room Tags to me should be like twins....identical, but each keep their individuality....but it isn't so!
First of all, the "FLAW"
In a room tag you can tell what "Leader Arrowhead" to use if the "leader" option is checked.
In a space tag, you cannot set the "Leader Arrowhead" at all!
Second, the "BUG"
Place a space tag with a leader (with no arrowhead).....now, in the visibility graphics turn off "Room Tags"
What happens to the leader of the Space Tag? ....... It disappears!!!!!
So the leader of the Space Tag is connected to the Room Tag...not the Space Tag....