+1 from me.
There should be an option to open or save an attachment. If I choose to open, the settings in the profile can be used (open directly), if I choose to save, a dialog should come up, where I can choose the folder I want to save to.
Personally I don’t see the problem with the “Downloadfolder”. You get messed up you harddisc, no matter if c:\temp or the downloadfolder is used. It is up to the user to keep the downloadfolder clean.