Wow, it's nice to see all the work you've done on this! I plan on making a teensysaber soon, as I've already got my blade made and a teensy I bought ages ago when I wanted to try making a saber with it, and then wanted to make one even more when I saw what you've done. The programming aspect sort of scares me away from finishing stuff like this, but I'm slowly getting there.
The programming is not so bad, at least if you start with one of the existing lightsaber code bases for teensys.
As for features that would be cool, I would want are bluetooth connectivity to a basic app for controlling the neopixels and typing in new parameters to the board from a phone.
Probably the right way to do that is to get a bluetooth le chip and hook it up to the RX3/TX3 on the teensy. Right now, all the neopixel stuff is controlled by code, not by parameters, so that would take some work, but is totally doable though.
Also I think it would be amazing if there was something for controlling a power level indicator/accent LEDs/crystals- which leads me to my next thing: if you've got boards made (of which I'm interested in one of), I imagine the space saved is quite a bit, so that there would be room for a crystal chamber in this build now? I would love to take a crack at it if it can be done!
It does save a lot of space. There might be enough space for a crystal chamber, it depends on the hilt and your skill.
I have some teensysaber V2 boards for sale here:
TeensySaber V2 for saleThe teensysaber V2 has room for three extra FETs on the bottom, which can be used to drive three accent LEDs (or one RGB led.)
A PLI indicator could be made in a few different ways. One way is to use a few small LEDs, another is to use a small neopixel strip, and finally, you could just hook up a small LCD, oled or e-ink display...
Basically I think everything you want is doable, but some is a lot more work than others... :)