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.
PLEASE, Graphisoft! This is simple stuff!