1. I had to pay for the server and setting up the pool was more than tiresome, so I put 4.6 as a reference to the atomic number of palladium, wasn't expecting people to actually use it. Also, the difficulty used to be much lower. Anyway, I set it to 2%, it seems fairer that way.
2. It's written on the website, there's an automatic payout at 10PC, yours should arrive within hours as soon as you reach a pending balance of 10PC.
3. The blocks you mined with the daemon are probably orphans, that is why you didn't receive fees - someone else mined the same block at the same time and their block was chosen over yours, sorry :/
4. I am not developing the coin, though I can ask questions to Lukas on the discord which I invite you to join if you have suggestions about anything related to PC:
https://discord.gg/xg3D8gThat was a very satisfactory answers. Now I like 4.6 better lol. Btw I suggest using time based payout instead of quantity, that will play consistency for people with different hash rate. Thanks.