Great feedback! I mostly use writeLaTeX for smaller projects (papers, talks, short notes), so I haven't done much on multiple file support. Some of the other online editors (e.g. scribtex and sharelatex) have better support for multiple files, I think.
Well, maybe multiple files are not all that necessary, but a tree showing the document structure and enabling you to jump to a certain section with one click in the tree would be nice :)
Great feedback! I mostly use writeLaTeX for smaller projects (papers, talks, short notes), so I haven't done much on multiple file support. Some of the other online editors (e.g. scribtex and sharelatex) have better support for multiple files, I think.