Southwest Climb derate question

I have learned from this forum that Southwest Airlines does not use derates in either the takeoff or climb phases, because it reduces the time from parking brake release to cruise, thereby saving fuel.

They do use assumed temps, but not the TO1 or TO2 settings.

However, because the PMDG NGX does not offer a choice of engine ratings for various airlines, I use the workaround of selecting TO1 to get 22k rated engines in the NGX -700. And logically, that would mean pairing that with CLB, not CLB1 or CLB2, since Southwest doesn't derate the climb. I have a question though, would it make sense to select CLB1 so that the n1 at climb is less than the TO1 setting? Presently, when I select climb thrust using CLB, the engine surges to a higher N1, and this does not seem realistic at all. Essentially, it appears the CLB setting is really for 24k rated engines, not 22k or less. So I figure that CLB1 would actually be the logical pair to TO1 to simulate the 22k rated engine without derates.

This may seem like a nitpicky question, but I'm a stickler for real world ops. I'm a little disappointed that PMDG does not offer the user the choice of changing the default engine rating in the NGX, even though the TO1/TO2 option offers the same functionality, it seems a little awkward, given the intense attention to detail and customer customization PMDG offers with the NGX. I wonder if there is any chance an option can be coded for a future service pack to offer the user the choice of engines in the FMC options, without resorting to the workaround.