Any window with an "OK" button would benefit from having an "Apply" button as well.
The "OK" button applies changes you've made in a window *and* closes the window. An "APPLY" button would apply those changes, but keep the window open. If you wanted to make another change immediately, this would save you the time of having to re-open the window and again find the property you were changing.
This is (from a user's perspective -- i don't pretend to know how to code!) an incredibly basic function, and one that would save a LOT of time.
I will continue to bump this thread with screenshots every time i wish i had an apply button, but am starting to wonder how effective the Wishes forum really is. I'll reach out to Graphisoft too -- last time i emailed them about the best way to request a feature they guided me here.