Controlling with a gamepad more than my telescope - by: emk

Hey,
I'm not new to programming, but after all couldn't actually say that I'm pretty experienced.

INDIlib running with my LX200 GPS works pretty good, also with the gamepad. I'm using a Logitech Inc. WingMan Gamepad. Version 131328. Kinda pretty old, I think from 2000. However it works fluently.
The gamepad has 2 axes and 11 buttons. I pretty much enjoy it to use it with the telescope via kstars (or from console) + indilib.
The lx200 driver offers the possibility to use 3 buttons for different slewing speed, 1 for parking, 1 to abort any movement and the 2 axes for slewing.
Leaving me, in this case, 6 unused buttons.

I know this question might be too general, but actually i don't really know how to attack this problem/question, so... I more or less just need a base to work upon, some ideas.
How could I possibly set a buttons function to, for example, make a picture, maybe a fits, using my Canon EOS 6D?

Do i have to write a new driver with the enable joystick option implemented as in lx200generic.cpp or can I somehow implement it in a already existing driver or just writing myself a new client, who is doing this task?
Best solution for me would be, to just have maybe a driver more to start with kstars, enable for both the joystick option and GO (, which would mean to write a new driver). Kinda just like now with the telescope.

Thanks for replying ahead.

Greetings
Erik