Regarding MinePeon with USB miners:
Is there any limit of USB devices that it will auto-detect (other than the 127 standard USB limit)?
When removing or adding new USB miners do you need to do anything over than reboot? (ie will it automatically detect that devices were added or removed and start using all available devices)
There is the unconfirmed limit of approx. 50 USB Miners which the RPi can handle.
When removing or adding USB miners you don't need to do anything. Insert one at a time, cgminer will autodetect it.
But for removal, well you could just pull them out but hot-plugging here really means HOT plugging. So don't do it, stop cgminer first in the console with
"sudo systemctl stop cgminer.service"
Wait a minute.
.
.
.
.
Remove the USB Miner
.
.
then
"sudo systemctl start cgminer.service"
Done.
Looking at this I think it might be a good idea to have a button where it stops the cgminer service for a minute or two and then restart again giving the user time to remove unwanted/faulting hardware.
Also maybe have a function that allows the user to update from a stable git branch or Minepeon maybe?