This also comes with files for testers as well as developers. Straight from the site:

New futures of 3.0t5-pre4
-refine vmu code.
-support compressed data saving. (now use 3-9 blocks to save).
-VMU save/load state support (use 10-20 blocks).
-long filename ROM’s save support.
-rename config file. first, you must set options.
-all of 3.0t5-pre3.

Keybinding during game:

analogstick: frameskip change (VMU display frameskip).
press B pulling R trigger: call quick save/load menu.
press Y pulling R trigger: call VMU save/load menu.

Thanks 6REAL.