I know itīs a hard way to develop a game.
In the past i graduated as a Developer and know the problems of a beta test....
but how hard could be to send a email with the betakey.
A beta-test is a stresstest and you canīt send the keys in waves when you only make a testphase of 4 days.
Actually i lost a full day of testing RB6:S just because of your wave system i know you wont get problem like the game release of Diablo 3 but to send slow waves is a joke!
Please send all keys in a last wave in Germany.
Sincerely
Silentsun8193