If you have the spring plunger style gas block, you can dremel modify the block with a cutoff disc carefully, to support an extra detent position if needed, and cut the flat on the regulator at 120 degrees to the other to make a new position like a 240 3 position regulator, and then drill a new port of whatever size you need with a carbide bit very slowly and carefully. 5C hex collet blocks will support 120 degree indexes, just tram one flat, tighten, and refixture the hex block.

I think I needed the extra detent on our barrel, and just made a ramp adjacent the other detent to continue rotating the knob to that position.

We made a suppressor gas port on our 240 Lima regulator and it worked really well.

It was a one position regulator though Ive seen older Army regulators that used to be three positions giving units a choice of what rate of fire they wanted. In Iraq on my first tour we had those.  We started the deployment on the low setting and ran into a few minor malfs, and by the end the vehicle mounted guns were setting 3, where the rof is like 1200rpm almost like a mg42, you pull the trigger and the belt is moving so fast it flaps up and down from velocity of the belt pull.

Dismounted or static most were then setting two, a little more conservative on ammo consumption in the applications where you can’t just drive away at will.