File upload is indeed a useful feature! Added to my todo list.
On the second concern, nested tags are supported so you can have something like #project1/tag1, #project1/tag2, #project2/tag1 etc. - does this work for you?
On the second concern, nested tags are supported so you can have something like #project1/tag1, #project1/tag2, #project2/tag1 etc. - does this work for you?
Edit: Another advantage of this is that cross-project tagging stands out because the full tag is displayed.