Remaping midi-Hercules 500 with DJUCED.

I saw some people are remaping AUX knobs (on Hercules inpulse 500) to be able to control dry/wet (and maybe echo length) of the FX's but they are doing it on serato DJ pro. I would like to do that in DJUCED. I have searched the internet and i couldn't find anything. I understand that mapings are saved in .djm file and i can read it with Notepad++, but editing it is beyond my knownledge. I would like to know if it is even posstible (and maybe how).

Than i though i would use my keyboard to control echo length in FX tab that is accesible on shift+loop (mode 6) and mapping seemed to work but then buttons did nothing. Does anybody have any idea about this.