Hi I am running latest OSMC on my Pi 2 and using this wireless mouse and keyboard pad… i am having problems with the Down Volume key V- workng. only the up volume key is working. any idea if an update will sort this? thanks. 
You will need a debug log that includes pressing that button.
Try copying his to /home/osmc/userdata/keymaps then rebooting https://dl.dropboxusercontent.com/u/30655053/hama_mce.xml
This works, thanks, however holding the volume keys only has the effect of pushing them once.