Until such features are available in the client, you can find some of the stuff you're looking for at:
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So I was thinking that if you exit a game (either because you closed the browser or you had a technical problem), and log back in within the 5(?) minute window, you will always get prompted to continue the current game, correct? Is it possible to decline and instead start a new game? The solution is that it shouldn't be. You should actually be immediately put back into the current game. Only after the time window is finished should you be able to start a new game. This is totally fair, because if you were thrown out through no fault of your own, you would want to continue that game. If you did it just to make your opponent wait, you have to wait too. Seems like a no-brainer. (Maybe it already works this way?)
Can this not lead to abuse? Playing an unscrupulous player where you request an undo all they have to do is ignore it and wait and they'll win? Or am I missing something?
*Arena continues asking you to discard even after the last VP have been removed.You are allowed to keep using the Arena ability even once the the VP are gone, and there are a few scenarios where you'd want to do this (Haunted Woods, planning to return to Action phase with Villa and play a Library (or similar card), likely some others).
*Why does Scheme insist on asking you to top-deck cards after the game is over?The scenario here is pretty obscure, but with Scheme it is possible to both gain a Madman and keep the Hermit if you choose to Scheme a Hermit and buy no cards. This can impact the scoring of a few Victory cards and Landmarks. I can't think of another case but there could be one.