One thing that always gets to me is that sometimes I have a lot of projects going at once and I'll have 10 or more tabbed projects open. Sometimes I've got a lot of things I'm pulling elements from for a new design.
Hatch is great for working on multiple projects, however, telling exactly which tab I'm in at a glance is kind of annoying. Especially if you've got multiple similar tabs open or you just want to start closing some tabs out.
Having whatever tab you're currently viewing be highlighted in some way would be incredibly handy. Be it just darker in color or outlined in a color. Or even if the text were a different color.
Just some "at a glance" manner of knowing exactly where you are on the tabs bar.