Ahh, for a second I thought you had solved my problem :-) Yes I've checked the Midi Mouse manual and there is no way you can change the preset numbering. Now that you can change the preset numbering in the Stomp (either 000-127 OR 01A-42C) it would be nice and very convenient if you had the option to switch to 001-126 also. Perhaps in an upcoming update :-)
Anyway, thank you so much for your time and your reply.
Regards Jan