I'll try to have a look at it if it would require many changes in Geany to migrate to this class.
It would need to be optional
Why would it need to be optional? If it works well on relevant platforms and do not introduce too much restrictions, why not use it completely?
but I think the checkbox from the windows native dialogs is still in Glade unless @eht16 got around to removing it ;-)
thanks for the reminder :D.