I have Serato 2.3.5 with the DJM-S9

I would like to customize the Saved loop on my mixer in this way, editing the midi XML:

1) Hit an empty pad to save a loop on the slot
2) Press the saved loop on the pad to recall it
3) Press shift+pad to turn the loop on/off

Serato standard midi map works more or less like this. The only difference is that I have to press Shift+Pad to trigger the loop and if I only press the Pad it turns on/off.

Is it possible to customize it as I described ?