Could you install addon? But it doesn't run? In this case I need kodi log file - there should be a clue.
Also what you get
systemctl status service.touchscreen -lDo you have some backup from nuc? Then you could use calibration file from there.
Here I put the image and addon if needed: Index of /S905/
I assume you already know how to use it 
Some parts needs to be enabled in kernel config to enable touchscreen drivers. Then it may work. I ask GDPR-2 for a help how to build this image (I'm not familiar with amlogic projects).
Tell me which image exactly you are using and I will try to rebuild with them enabled.
From what I see touchscreen stuff is not enabled on Amlogic kernels. I assume this is the first problem.
If you really can't use systemd-run then use little more hackish approach.
Make one helper script which runs before kodi (run it from autostart). In this script make a loop and inside loop start your pegasus-fe.sh script. And to know when to start it and when to stop use one temporary file which is created from kodi or some signal.
nohup doesn't work.
I think only systemd-run will work. Check why your script doesn't like it.
Try running it through
systemd-run /path/some_script.shMost of all I thought this SW was meant to be open to the community for fine tuning and experiments or did I get the wrong message?
It is open: source code is available and you can change it to your needs.
Btw: I did make whole system RW few years back. And it was very, very easy. Only few lines of code changed.
This doesn't work? ssh-public-keys
And it is the same as with normal Linux distro.
Creating appropriate file in /storage/.config/pulse-daemon.conf.d/ doesn't work?
From what I saw those Waveshare screens are using custom hidraw driver as described here: GitHub - derekhe/waveshare-7inch-touchscreen-driver. I rewrote the driver for tslib and it was working for few users. Maybe you will get luck too 
I think creating file /storage/.cache/reset_oe or /storage/.cache/reset_xbmc forces to make a reset on next boot.
One option is to use overlay like here: Alternative to Kodi packages: Modroot - Development - LibreELEC Forum
Then I'm out of ideas.
When you press Download button you select a FOLDER where file will be saved.
