I've been using scrivener for some time. Manuscripts looks like an improvement for scientific writing (which is what I do) EXCEPT
Scrivener has a facility for saving snapshots of sections and diffing any past section with the current section. This is THE killer feature of scrivener for me, because it means I can cut words and edit and never lose anything if I decide i want back previous wording.
Manuscripts does not appear to have such a feature...am I missing something? Is it something you will add, or is it off the table?