Attachments in read only mode after "Drag & Drop" into folder from Kmail

Hi, if I have an attachment in Kmail and I want to save into a folder I have 2 possibilities. Either save it per "Save As ..." using the right mouse button menu or by "Drag & Drop" it directly into a folder. The former creates the document in read/write mode but the latter in "read only" mode. For I nearly always use drag & drop I normally forget to set the read/write flag for this file afterwards and realize it not after make changes to the document and try to save it again. This happens very often with my workflow. This is a very inconvenient behavior. Anyone an idea if that could be changed without recompilation? Otherwise I would call it a bug. regards Gerhard