I add "Bug?" because I assume that was the intent of letting 0 being in the valid range, but currently, when those are the settings, the gadgets do nothing.
Forge version: most recent as of 9/22/18, version 2760
Modlist (though issue persists without):

Configs:

shown behavior:
https://gfycat.com/KaleidoscopicScalyCutworm
Pull request #82 implements this. Dire just hasn't implemented it himself yet.
maybe a github issue will get it implemented faster? ehe :p
thank you, though.
I鈥檒l add it! :). P.s I鈥檒l implement some of those pull requests when I can.
Most helpful comment
https://github.com/Direwolf20-MC/BuildingGadgets/commit/e8b387847cd3007b81a11abc4c79ebd25d43cb0d
Added :)