If you replace the table file after the client starts up but before you actually open up a table, then this will work. You also have to mod the menu (if you want), so you actually need to replace both Game-Table and Game-MenuBackground. You have to do this each time you start the client. Making the files Read Only doesn't work, 'cause then you just get an error when you start up the program.
This is the mod I use for the PokerRoom network. Took about five seconds to make in Paint. But it'd be cool to see some better ones (I haven't found any).
