4 deck midi mapping for Hercules Steel

Hey

I've tried to map my Hercules DJ Control Steel for playing 4 decks on Traktor pro, but the only thing ive managed to do was mess it up Thank god for backups

What i've wanted to do is change the stop key on it to act as a switch on decks A/C and B/D so you would press it once, LED would light up, and you would be controlling deck C with all the controls and after you would press stop again, LED would switch off and you would be back to controlling deck A

Anyone managed to set it up successfully already? would really appreciate some tips

Thanks