This is much more an "it would be nice" than a wish per se, however...

I have some SGUs that I use when doing practice exercises, where typically I have four bar lines going through a chord progression over which I practice "in all keys". Mostly they're a consistent sequence, e.g.
Dm7|G7|CMaj7|CMaj7
Cm7|F7|BbMaj7|BbMaj7
Bbm7.....
with a shift at the DMaj7 to Ebm7 to do the other keys.

It occurs to me that a means to step like that would be quite nice, though making the SGUs is hardly difficult.

However ... a means to randomly select the key at each repeat of an SGU, would broaden the excercise into one where the key for each cycle is a surprise, which would stop one dropping into a habit of automatically changing to the next key in the known sequence.

Jazz relative beginner, starting at a much older age than was helpful.
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