2) It is impossible to add some algorithms. I mean, you can add them and it seems like they are added but they never appear in the "Online Services" tab (the one with the Revenue/Profit list, not the one inside Options).

Try it yourself... attempt to add "yescrypt" and make it appear for Hashrefinery. I have tried on several computers and the program simply refuses to show it even after following all the steps, adding the algorithm, adding it to the mining software and then adding it to the pool in Online Services (the one inside Options).