Here is a reply from Hagstrom, looks like it miht be a solution, I'll try it tonight and let evryone know..
----- their reply -----
Thank you for your email. The MAME program does seem to ignore fast Make/Break patterns of keys such as what would be done with your macro sequence you have listed. You are on the right track as far as trying the delays, but the delays need to be between the make and break of the key. In a KE72 macro, the make and break will be sent as fast as the machine will accept them, which is why it works fine in notepad or most other programs. For MAME, you would have to do the following:
IN13:[(+)t] [(D)10] [(-)t] [(D)10] [(+)z] [(D)10] [(-)z]
You can experiment with the delay values to see what will work with your system, but this is the way that you can delay between the make and break of a key.