So this affects each project type I think. When I select more than one project and hit del, multiple dialogs comes up, with the question, would you like to delete the project and the sources too? This is a pain in the ass, if you really want to delete maybe 5 - 10 projects at the same time.
My solution is to bring only one popup with multiple checkboxes for the projects. To say yes I want to delete this with the source and this, oh ok this not, or only this, but not the source.
That would be better. The current behaviour is a really bad UI. With the new suggestion it could be possible to delete projects in parallel, what makes the deletion more efficient.