Hi,
I'd love to have an option to automatically align text and equations and to use style sets for formatting. For text alignment, I'd favour a solution like the text blocks in MathCad Prime that span the whole page. One centered equation per line including numbering would be neat for aligning mathematical items (maybe with an option to group several small definitions on a single line). Regarding the style sets, paragraphs and headings would already suffice for me.
This would be a move away from the MathCad user interface, I know, therefore I would make it optional in order to not upset existing users. Anyway, I think that automatic alignment and formatting using style sets would hugely benefit productivity and also make exporting the stuff to TeX or HTML much easier.
Regards