6/16 ? How pretentious. Why not 12/8 , which is essentially the same thing, and much easier to transpose into 4/4 . Also,
this is a very bad idea, and makes very little sense to me. If each layer is supposed to end at the same time, what does it matter what time signature it is? If the layers do not end at the same time, you are better off making a new sheet to accommodate the different time signature anyway. A different time signature for each layer is bound to confuse half of people who play the game.
Any musician worth his salt will be able to manipulate the current system to conform to almost any time signature. Use your head.
Child: some people work for a living, and there are more pressing issues to attend to on the game and site. It is not essential to game play at all that there be anything but 4/4, given the pliant tempo. Perhaps Starburst ran into some trouble when coding alternate time signatures; perhaps he is more concerned with the various 404 pages covering half of the links from the game.
Take your frivolous whining elsewhere, or better yet, just be thankful for the features you enjoy now. I’m sure if you think really, really hard, you might be able to figure out how to work around the time constraints. If it seems too hard, or you feel cheated in some way, you can always GTFO.