I was kind of frustrated by the 16 note per sequence limitation of Beatmaker. You could use the groove menu to get some 1/32 notes into a sequence, but that is still pretty limited in how that is done, and the groove menu is still a little weird to edit precisely. Here's a cool way to get 1/32 notes.
1. Create a two bar loop in the sequencer.
2. Make a sequence with the note combinations you want as 1/32nd notes.
3. Double the tempo and export the file. Set the tempo back to its original timing.
4. Load the exported file as a sample and use sample start and end times to find the parts you want to use.
Its tempo specific, so if you change the tempo, you'll have to re-export your 32nd note samples. Not perfect, but works for now to get a bit more variation in rhythms!
Also, the tempo goes up to 260, so you can create 1/64th notes with tempos 65 or less.