STARLESS72  "Remove projects and tasks"... isn't it what the Edit -> Delete menu item does?  
(Version 1.2.4)

STARLESS72  A much needed tool, thanks!  
(Version 1.0)

STARLESS72  Sorry, where can I find this funcionality inside QS? I can't find it anywhere, and I would like to avoid using a separate application if possible. Thanks.  
(Version 1.5)

STARLESS72  With kind (and fast!) help from the developer, I found a way to work around this problem: press and hold down the Option key (Alt), then open the File menu and select the Add Frame menu item. Now the file requester will allow you to choose any file type, image files will not be grayed out anymore.

It's important that you hold down the Option key BEFORE opening the File menu, otherwise it will not work.  
(Version 1.0)

STARLESS72  I also have the same problem with GifBuilder 1.0 on MacOS 10.4.8: all image files (GIF, TIFF...) are greyed out in the file selection dialog which opens with the Add Frames command, and cannot be selected. Drag&drop does not work either, so the program is unusable.  
(Version 1.0)