I generally leave Parallel Projection turned on. However, I have been playing Saints and Sinners a lot recently, which doesn’t require it, and I can actually play with Large FOV at 100% scaling, it looks quite nice.
The only pain is having to launch it through Pitool. I put on the headset, strap on my Index controllers, then have to look past my nose under the HMD at the monitor to launch the game (I wont be able to do this when the comfort kit arrives with a better nose pad)
It would be very nice and convenient if there was a game browser inside Pimax Home that, when launched, applied the same settings that are applied from Pitool.
This way I could launch Steam VR and play things that require PP, then exit SteamVR (return to Pimax Home), and launch a new game with PP disabled, all without having to remove the HMD