I haven't done much with .desktop files. I know there is the issue with hildon menu starting in applications/hildon as mentioned in the link you referred to. I'm thinking more along the lines of making it so the desktop entries aren't hard coded to use osso-xterm should a replacement or alternative come along.

As it is part of the specs (https://standards.freedesktop.org/de...t/ar01s06.html) I don't see why it couldn't be added. The launcher would then just need to check for flag before executing the app.