Tried it out with Claymore 9.4 mining just ETH on nanopool and it looked like it works, I get extra shares from worker "x", however, my calculated hashrate decreased by ~10% after I moved all my rigs with noDevFee.
It should be pretty easy for Claymore to detect the no devFee app (just read if shortcut is made at startup), and penalise the miner accordingly. Any comments?