Debian :: Multimedia Keys And Non-cyclic Switching Off Keyboard Layouts

After installing Debian 8.2 I tested my multimedia keys and they all are correctly detected by xev and works as expected. Then I start to configure my keyboard. I need to use three keyboard layouts EN, UA and RU. By default I can switch between them using selected keyboard shortcut with following pattern: en→ua→ru→en→ua... But I want to switch layouts independently, using different keys for each layout, for example: qWCapsLock — enable EN layoutShift+CapsLock — enable UA layoutCtrl+CapsLock — enable RU layoutAfter googling and reading different forums I come to following solution (here is documents and discussion in russian). Create files

/usr/share/X11/xkb/compat/mycompat
Code: Select all 
default partial xkb_compatibility "default"  {
   interpret Mae_Koho {
       action= LockGroup(group=3);
   };
   interpret Zen_Koho {
       
[code]...

This works perfectly, but all multimedia keys now not recognized by xev and as result they does not work. I know that I can use xmodmap to map keys, but maybe same result can be achieved by fixing some of the newly created files or setxkbmap+xkbcomp command listed above.