Yes it is automatic, so you don't have to switch off, that be the point of automatic!
Another thing, you wouldn't need 2 different .rc files either, just create the modes with advv.exe and create the standard res modes 320x240 and so on and the med res ones 512x384, 512x400 and so on.
Works a treat..
One point, you'll have about zero chance of buying one in the US, US like to buy US products, not European products.
Your best bet is to buy the Wells Gardner D9200 which is a similar price..