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I guess XFCE control center should contain more options. Don't know how how to upload images here, so see mine post at Mint's forum. What do devs think about it?
http://forum.linuxmint.com/viewtopic.php?f=29&t=199307
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Hello and welcome.
The Xfce Settings Manager has the facilities built in to allow distro maintainers to add programs to the Settings Manager (as your post over at the Mint forums shows). This is really an issue with your distribution and not Xfce. You should follow up with the distro maintainers.
Please remember to mark your thread [SOLVED] to make it easier for others to find
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looks like this bug: https://bugzilla.xfce.org/show_bug.cgi?id=11703
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