Wish list for next version of MFR.....
4mb of RAM
Moonsound
MSX Audio Bios
GFX9000
Toaster
Balls Scratcher
I have already implemented all things of your list but the balls scratcher.
I have compatibility problems with that. The one hand version seems to work fine, but there are a few problems when scratching with both hands. I need beta testers XD
All jokes aside, the FPGA in the cartridge has not enough capacity to implement anything more.
In order to implement MSX-MUSIC or whatever, a new cartridge must be done (new PCB, different FPGA, new VHDL code...)
Don't expect it in a near future 
The one hand version seems to work fine, but there are a few problems when scratching with both hands. I need beta testers XD
1st Volunteer 
Sorry, the missus refuses to test the ladies version.....
This is my problem:
What to do? :)
I remember that... It says there's not enough memory to load system software... Slide your WX's firmware button completely to the right and you should be rid of this message...
Thanks! Yes, that works and now I do not need press that R key. 
interesting MSX, the WX