I didn't understand what you tried to exemplify, but I can answer the first half, where you want the sector properties window to pop out after creating a new sector:
Tools > Preferences > Editing > Edit sector properties when drawing a new sector
If you draw a sector that reuses linedefs from another sector, Zone Builder doesn't interpret that as "drawing a new sector" but rather "splitting an existing sector", so the "Edit Sector" window doesn't pop up automatically, unfortunately. Obviously you can still edit the sector properties after you've created it though.
As for the pasting thing, the option you want to turn off is Tools -> Preferences -> Pasting -> Adjust heights to match relatively with surrounding sector.
Which part are you referring to? The fact that it considers it splitting a sector instead of creating a new sector? I'm just guessing here, but I imagine it's because it's not always clear which of the resulting sectors is the "new" one. Imagine splitting a sector in half right down the middle: Now which part is the old sector and which is the new sector?I'm guessing that's done to bypass an error?
Here's a dumb suggestion that would make both vanilla and kart mapping a lot more bearable; an 'order' field for checkpoints which would just add 360*value to the checkpoint's angle. Would be useful for maps with a lot of checkpoints.
Is there a way to make it compatible with Linux Ubuntu?
Yes. (the engine is the same loading-map-lumps-wise lol)Does this work with kart?