Can't wait to use it (on OSX). Hehe.
Edit:
I would like to be able to see the # of mixins on the slider where you choose how private to make the transaction.
That's in the works - we've just been debating it peripherally (for 2 weeks) so we get how it displays correct. For the most part, even a power user may not care about the actual value after a while, so we don't want the numerical amount to be too obtrusive (or too hidden;)
Set the default values to something well thought through, but let power users reconfigure the values used in a preference setting or file.
It could also be an option that shows when you hover over the slider. But I'm sure you've thought of all this already, just thinking out loud.