Complete list of available codes for keyboard+mouse emulation

[neitanod]

When I try to configure controls in RetroArch/DOSBox in SNES Mini sometimes I need to map the gamepad D-Pad Up/Down/Left/Right to Emulated Mouse X/Y axis, while some buttons should get mapped to specific keyboard keys. I was able to do the latter but not the former, so, the question is: Is there a list of codes for "Keyboard/Emulated Mouse" input type that would include codes for Mouse X/Y axis?