Thanks for the comments!
The context problem is a continual issue with translation - but most of the time our customers handle it by adding comments to jobs.
We do allow you to attach comments to the job call - so you can add context there and also links to related material if required. We're considering adding an option to attach files too.
You can also group jobs together if you want them to be handled by a single translator - this obviously takes longer but makes sense for all-in-one projects.