Reply to Loop in & jog wheel moves loop start - what's the actual mapping happening?

Hey DJTT, have had my S4 for 4 days now and am loving it However, I can't figure out how to see a mapping assignment table that will tell me what midi notes/combinations trigger what actions. This is kinda my general question, does such a mapping assignment table exist?

The specific reason i want to know this is, I see that when you have a loop set and you press Loop in and move the jog wheel you can change the in point of the loop to fine tune it, what I want to figure out is if I can re-map this function to the loop length encoder to change the the loop in point by the corresponding loop length shown on the encoder at the time of action.

My believeing here is this;
8 beats before a breakdown or before a track kicks back in from a breakdown, set an 8 beat loop, trigger some effects as it loops then press loop in point and reduce length of the loop from the loop in point by 4/2/1/.5/.25 beats until you have the crowd whipped into a frenzy and then drop the track back in, instant mayhem

i know you can do stuff like this with the beatmasher/gater/delay etc but if the sound you want to effect is in the last couple of beats of the loop how can you achieve this?

Maybe something is staring me in the face and I have spent too long in front of it to see it, if so feel free to berate me!