@herf (the simpler solution is probably indeed to allow the settings to go lower. People with a low-quality screen will see by themselves down to what level they can go for it to be contrasted enough)
@Darba I'm sorry it's not possible. There's nothing in the Registry for it.
Some advanced users might want to tell me that it might be possible with AutoHotKey and I wouldn't be a bit surprised with all that it can do, but I wouldn't know how to do it. So, I recommend asking the AutoHotKey communities, including the one on Reddit.
@anderk the keys supported are alt+PgUp and alt+PgDn - we also have an option to turn on "surface keys" for Microsoft surface keyboards when the function lock is on.
@herf Hi, I like this software. But I want to use it in an VDI environment with Windows 10 and our client is a zeroclient. So I cannot install it local.
With the entry in registry the message in the GUI changes to "Disabled" and still takes no effect.