Power Saver Screen Refresh Rate / Screen Dimming

I would like to see the “Power Saver” mode be able to adjust screen refresh rate. Even if it just drops from 144 to 60hz when unplugged that would be great.
Screen dimming is too aggressive in my opinion. I like it, but want to adjust the time out when on wall power.

I could just wait for Wayland to fix all these things; but I suspect a .conf file has the X settings somewhere already. I am using Fed 37, Gnome 43. There is a manual way to set refresh globally, with no on/off battery power options. (that I see)

Any tips appreciated. If this does not exist; nod to the devs.