Sansa Clip Zip button comboing / assigning issues

[ImpTaimer]

Model Number: BH1109CDLK-4GB
Sansa Firmware: V01.01.18A
Rockbox Version: 5513c6d-120322

It seems, at least with the one I'm using, I cannot press certain button combos without encountering stuttering or no response. There are also issues keybinding / assigning buttons.

[Movement]

-Up and Left
-Many combinations involving the Back button.

[Assignment]

-Buttons are not labeled properly when given the option to assign keys.
-Volume Down not assignable.

[Tested On]

-Rockdoom
-Rockboy

[saratoga]

It seems, at least with the one I'm using, I cannot press certain button combos without encountering stuttering or no response. There are also issues keybinding / assigning buttons.

That is normal.  The Zip wires most of the buttons into a row/column matrix, so its not possible to have certain combinations pushed at the same time:

http://www.rockbox.org/wiki/SansaAMSHardwareMappings#clipzip_buttons