If you're interested in score layout, Steinberg are working on a new score layout application with (from what I gather) a lot of emphasis on layout flexibility, and there are a series of blog posts about some of the more interesting and subtle score layout issues, including how the other major notation applications handle edge cases.

The most recent post was http://blog.steinberg.net/2015/12/development-diary-part-12/

No disclaimers; I'm not affiliated with the product. Just a keen reader of the development diary.