I'm mining with heavy algo. Will dev donation work? If not, can I get a dev sumo or haven address to donate to using the charity feature?
charity mining was removed from version 1.2.4 , and this is exactly the reason why. Too much algos, there would be problems if you would mine for ex monerov7 but charity isn't the same algo..
Devfee works as expected, for every algo there should be no problems anymore.