Nofastfat, we're doing our best to keep all parts of Flox, including the leaderboard, as stable as possible. The beta-phase is of course a little special, because a lot things are constantly updated -- but still, we work hard on keeping everything super stable. Since we're using the Google App engine, our servers will be online when Google is. 😉
pishgm2, that's a classic problem of Flash; with decompilers, you can reconstruct a game pretty well, so the game key would not be too difficult to extract. There are a few obfuscators and scramblers on the market which you can run over your SWF files, this will make it much more difficult. But still, it's always possible. The same could be said about C code, though: a good hacker will always be able to find a way to that string.
So, if you're concerned about the security, here's what I would do:
1) avoid having the key in the code as a constant; instead construct it at runtime, with some creativity 😉. This will at least make it impossible to find it with a search through all string constants in the code. Like this:
// real key: "a427bfce-05fe-4a6a-9acf-1122d5ce4972"
var key:String = [
"a" + (42*10+7) + "bfce",
"05fe", "4a6a", "9acf",
"" + 1122 + "d5ce" + (4900 + 72)].join("-");
2) Try out an SWF obfuscator. In the company I worked for in the past, we used "secureSWF", but there are more options around.
Good luck! =)