So you mean you only want 1/2 or 1/3 of the screenpad to be use as touchpad if possible, right? Then why don't you use the original one? Anyway, I will report your opinion to the related team. Thank you.
It would just be nice to have it resizable. The original touchpad is tiny as I'm sure you're aware, and also I would want to have a larger touchpad on the left side of the screen while still having some windows open.