I use an F65A, I'm not sure what your looking for, but I have some stroker clearance programs.
I'm also working on a mastercam X post processer, but it's been not quite done for awhile now.
I learned a few tricks about using G-code and making generic circles, but it takes a lot of time to make simple programs by hand.
also I'm not sure what an F67A or F68A has for extra options, or if your using one of those.
KC