im making some modifications to bitcrack so that it can calculate random keys instead of incremental (i know the developer said he didn't see the point of random but it doesn't make sense if nearly everyone is using bitcrack the same way and generating the same results, everyone would just be following each others footsteps - randomization i think solves some of that)
You're spending too much thought on this. Just create a launch script for bitcrack which generates an entirely random 64 character hex string each time you run it and use this string as the keyspace parameter. There's no point in having a different increment than 1. Besides, generating an entirely new random key for each iteration will add a huge overhead and significantly reduce search speed. With a random starting key, all subsequent keys will still be random enough for what you're trying to achieve.