i don't want to do this, and i have to add the following line in the .desktop file. can this added in by default? OnlyShowIn=XFCE; and there is another problem, when disable a application to autostart, xfce will add a Hidden=true, and also disable in other DE... can xfce use X-XFCE-Autostart-enabled=false by default?
sorry for my english.
Uh, no. It's a generic autostart mechanism. OnlyShowIn is the way to go. Since most people won't need this, there's no way to do it in the GUI. Eventually there will be a more full-featured autostart editor that will let you do this via an 'advanced' tab or something, but I'm certainly not breaking the standard to fix your pet problem.