Hi again, shortly out of a sunny Saturday afternoon 
Just tested the percentage moving and it also works fine 
Regarding an own fork, maybe ‘pimatic-raspbee-plus’. In general the idea is good to proceed if really @kosta isn’t available any longer.
But beyond I would have a bit the fear, that here also something like with IO Broker happens, where you meanwhile can find 146 forks only for Zigbee. I would have no clue how to handle such as a non-developer …