I noticed on the Toyota 4AGE, if you was on full boost (0.7Bar) and let off the throttle while ALS working it will go to Zero vacuum (between vacuum and boost), but when you open the throttle again on it will get back to full boost within just few milliseconds, I had few logs for that in the past, but not sure if I can find them.
I had success in building boost while ALS is working (0.2Bar), but that was so brutal on the engine (1.6L) and made so much heat, it's not good idea to have red glowing exhaust-manifold/turbine while on track, so we had to lower it.
On the posted before cars, I didn't log the ALS, so I don't have any idea about it, but it wasn't building boost as well, I will try more later with these cars, as they will be used for drifting and the owners should do the proper trainings, so am thinking in raising the ALS effect step by step, until the get used to it.
For the driving, you will not have the difficult driving if you used a switch, but you have to know how to get back the car on the rod when you are shifting specially on corners, it would take you 30 min to get used to it, but with open throttle ALS, the driving will be harder especially when you are in the area that’s around the idle, as you an tune it to get smoother, so I found a way to select between open throttle ALS and normal driving mode, and the owners likes it.
