remotelock code sent only 2 weeks before checkin in the lock

Hi

i am using remotelock for my lock management and i am happy. In my previous PMS i could chosse how much in advance to send the code in the lock, This prevent to send a code many month in advance. TH eissue i am facing is that in my current plan, i am limited to 150 guest codes, and by sending all the codes in advance i am busting my limit and it block new code from being created.
I would reduce the number of guest code created.