front+back controls for objects will be added in next version.
i will have to add options for "cleaning" object files, and for saying to *not* save an object file.
thanks for reminding me that a move should also move the object files.
you can easily (manually) expand canvas size from the new resize dialog - but it's a good idea to have an option to auto expand it to encompass any objects.
grouping, vertical text, text rotation are also nice things not sure if they will be feasible though.
(don't forget that screenshot captor is designed to work well with other graphics editor, so you can always add fancy stuff in photoshop,etc.)
i dont understand request #2.
#4 sounds like a good idea to me, i will look into it.