[Mstn CE VBA] Turn off Undo capabilities


I have a VBA routine that deletes lots of elements (after copying\converting a file from dwg to dgn).  I am noticing that I am getting a lot of disk activity to the Users\AppDataLocal\Temp\Bentley\Microstation\10.0.0\Undo\xxx.tmp files.  I do not need to "undo" anything here.  Is there a way to disable the Undo feature, run my routine, and then re-enable Undo?