As far as I can tell using the default profit switcher from MPH works without problem with the PPLNS scheme. Using multipoolminer may be a different story as you might disconnect before you get a share in the lucky block.

I used to use a software to switch between profitable coins but after I moved to MPH I just restricted my miners to whatever MPH offers or mine in another pool.

However if I am to provide a suggestion regarding patent scheme and autoswitching. I do miss the zpool autoswitching implementation where you can adjust each algo weight to compensate for your own hash rate on different algo. It is a bit more tedious to use but very efficient. Sadly pool did not pay well. I do not know if he was hiding fees or just bad implementation of coin switching. I was a noob then. But I did realize I was being paid too low despite a huge list of autoswitching algo and coins. Hence I looked for a more reliable pool.

So far MPH has paid mostly a little above expected specially on monero. If it's below it's below just a little which comes down to just luck. So I'm satisfied for now on if it's straight 1 algo profit switching for ethash and equihash coins.