Wait -- I already know the answer! "Fix annoying-thing in Logos 6 first!" :-)
And we will! Multiple Logos 6.x releases are already scheduled, and you can help us prioritize improvements, optimizations, etc.
Visit http://logos.uservoice.com/forums/42823-logos-bible-software-6, which has just been updated to reflect Logos 6 changes.
Re-distribute your votes! Sort by 'Hot' or 'New' to look for things that aren't already at the top of the list.
We really do pay attention to UserVoice -- it's one of the best ways to get your request to the top of our list.
And after you've helped us prioritize the Logos 6.x path, post your crazy / wild / big idea for Logos 7 here. Should we have a new data set? A completely new feature area? More videos? More teaching material? A cuneiform word processor? Scanned images of original manuscripts? Manual categorization of theologians? Bible words tagged by emotive impact?