Good points, Belinda. I’m trying to strike a balance between adding more choices/variety and overwhelming the average user with a plethora of options. There will likely always be limitations in terms of what you can do, but hopefully I can cover the vast majority of what folks would want to hear. For example, I plan to offer multiple arpeggio patterns. And for Texas style strumming, you can already specify the bass notes manually if you desire, although I’m also going to try my hand at automatic bass walking – no promises there.
Being able to manually set up bass runs is something I’m going to offer, definitely, although not in the initial release of the new strumming patterns, most likely. Hoping to offer some “smart” automatic bass runs for a few styles that will hopefully negate the need to manually set up bass runs in most situations, though.
As for when the new strumming patterns will be available… like all large projects, the date keeps getting pushed back as the can of worms keeps spilling out worms. 
Turns out I won’t be able to start recording in earnest until early/mid October, so in the meantime I’ve shifted my focus to improving the codebase, with a massive refactoring effort spanning hundreds of files and thousands of lines of code. The upside is that
a) I’m laying necessary groundwork for the new strumming patterns,
b) I’m dealing with tons of technical debt that will make all future development smoother, and
c) I should be able to get at least one or two new features (like medleys!) up on the beta site later this month. 