That method works but it's very hackish and not something I'd use, since I think it's better to just use a different j2l file for each "entrance" a level has. This results in more files, but it goes more smoothly from the player's perspective, which is more important in the end.

I would definitely like to see some way for an exit event to point to a particular start position in the next level. It's not as important as having multiple exits be possible, though.