Currently we have two layers: first is DF current profile, where we have simple click on maximize button to maximize window as DF profile dictates, and second is fullscreen or Windows default, where Shift+click on maximize button maximizes window to entire monitor regardless of DF profile. What I ask is: could we have a third layer between these two? Example:

Environment:
4K monitor
800x600 window at top left corner
Monitor is split evenly into four via "Four" monitor profile.
Monitor is split evenly horizontally into two via "Two" monitor profile.
"Four" is set as active profile, "Two" is set as secondary profile.

If I click maximize button on the window, it will maximize as "Four" says: into 1920x1080 window.
If I Shift+click maximize button on the window, it will maximize as Windows default says: into 3840x2160 window.
If I Ctrl+click maximize button on the window, it will maximize as "Two" says: into 1920x2160 window.

I understand that it is not you currently support, it was a request for your team to implement it. 🕊️

Jury-rigging such a complex functionality is basically impossible, especially without creating additional hotkeys or buttons

For your team, on the contrary, at least from here, it looks like just an additional if-else in the code (◕‿◕✿)