Jim for this size machine to cut the materials your after cutting then you really need 2010 screws but it's not so much for the speed and more for putting the usable Torque in the place where it's needed.? When cutting.!

With correct voltage and decent drives Expect around 900-1100rpm for nema 23 motor before torque starts dropping off fast. So like has been said with 10mm pitch then 10mtr/min rapids is no problem really but that's a minor plus. Whats really important is that the bulk of the motors torque will be around 4-600rpm and that's where you'll be when cutting woods,plastics etc.
Now for Aluminium then 10mm pitch is waste and you'd be better with 5mm pitch for the increase in resolution and torque. Again 5mm pitch will give 5mtr rapids but when cutting the motors will be working much lower up the torque curve giving best torque where it matters while cutting.

You workout what you'll be doing most off and then decide what's important to you.? Resolution or speed.?
All I say is 10mm pitch will Cut Aluminium just at lower resolution which unless doing fine detail engraving won't be a problem and if you do plan on doing fine engraving then you've built the wrong machine anyway.!!

Forget rotating ballnut Idea it's not needed for this length machine and makes things overly complicated and an expense that's not needed.
The BK15 blocks will easily handle any RPM a stepper can reach so don't worry your self with that.!. . . It's a NON issue.