Re: snow mt
I'll expect something similar on the Forma, yeah. We don't have finger "up" events for *individual* contacts on snow; instead, we have an *all contacts up* event (in the form of KEY:BTN_TOUCH:0).
In practice, we don't care about this loss of precision in KOReader, so I did get rid of the individual contact tracing.
(c.f.,
https://github.com/koreader/koreader/pull/8021 &
https://github.com/NiLuJe/FBInk/blob...ce.c#L244-L268).
I'm not entirely sure whether you can afford the same loss of precision in Plato, because you have more complex multi-touch gestures where individual contact loss might be meaningful.
Re: Elipsa lights:
Ah, there you have it

. Warmth & individual light control is not officially supported, but the sysfs entries are all there.
I expect that was in an attempt to avoid the same fiasco as on the Forma

.
I haven't really played with it much, so I don't know exactly how all the LEDs are mapped, so the TL;DR is: don't touch the color entries

.