1. It is a work in progress, but very playable in terms that you can attack monsters, loot, card items, trade players, npcs etc.
2. Should work just fine, though I haven't tested it, I don't see a problem.
3. There are no working spam/hack programs that can be used via browser that I know of, so you are safe regardless from 3rd party programs at this time.
4. Yes it can be used with Hercules, I have a demo setup with Hercules if you want to take a look at it you can PM me.