But who wants to wait? lol
Take your chances I guess, but people have already enabled it and say it's working.If you enter it in console use this line (without vars.):
reservedSlotsList.aggressiveJoin true
If you add it to your startup.txt use:
vars.reservedSlotsList.aggressiveJoin true
Note there is a delay once you join the queue, so be patient for it to kick in.