Additional parameters and 4-axis GUI

[RaphaelDives]

Hey,
I use bCNC for my MPCNC. (Congrats and a very big thank you for this great piece of software btw.)
On the Hardware side I'm running grbl-mega-5x with cloned axes for x and y on a Ramps board.
In total I have 4-axis machine, with 6 axes - X/Y/Z/X2/Y2/A. (A is a rotary axis)

So, first question: Is it possible to add GRBL Parameters in the controller-config section (I nedd $100 to $105 for my "six" axes).
Of course it would be VERY conveniant to configure the cloned axes together, but thats not neccessary.

Second question: There's a GUI for 3-axes and one for 6-axes. Is it very hard to do one for 4-axis? ;)
Maybe someone could show me the direction and I could try myself?
(I've done quite a lot python during my PhD for calculations and simple scripts, but never on such complex projects...)

Thank You very much!

Cheers
Raphael