1) PMS-PD : Is the usb-C port dedicated to solely power delivery? Or can it function as a usb port for a controller adapter?
It functions as a charger port and data port for transferring between your PC and the internal USB.
2a) Are gamecube controller start buttons suitable replacement for the lower 2 tactile buttons? Or are they different in size?
2b) Are tact buttons short + long required for mounting or preferential?
3) Does the improved (assuming) regulator for 1.8v (RVL-PMS-2) help with battery life relative to the PMS-lite? Having difficulty determining the practical difference otherwise.
There is a minor improvement over the stock LDO, in total maybe 10 mins difference over an entire discharge.
4) Does GC+2 remove snapback? Or is a snapback removal capacitor/s2b chip still needed
? & on a similar note are there any examples of how the GC+2 configuration works? I'd be planning on (almost definitely) notching my gate [I haven't seen anyone printing notches & I'm not sure how flexible the configurator is (if I can set a specific input to give a particular coordinate all the time similar to goomy's pcb
then printing with notches may be a possibility)]
It won't remove snapback.
5) Is it possible to mention the model of the higher-quality display that we should watch out for to swap in?
You can use the Eyoyo IPS display but the driver board is too large to fit, I believe you can use the Eyoyoy IPS display with the buydisplay PCB.