Actually once was easy to hack, all the variables were local and in plain 4Byte *1
Now everything is server cheched and the variables obscure. I've found out how to increase my score playing with the opcodes in the memory browser, but they aren't perma. I've to decompile thw swf to find out some array to change to change multiplier or maybe the number of gems you need to match.
For now you can use speehack, but it's a little unstable, sometimes crash. Keep speddd at o.7 o.5 not less to avoid server lost sync with your game. Maybe you can strangle the connection with charles to slow down the server syncs and reduce the change of crash.
I'll try to find out something with fiddler or charles.
For now use speedhack, you can do all the score you want.