[feature suggestion] In the Applications button menu, show all categories that have some apps installed
I installed SciLab. Its desktop file specifies categories Science and Math for it. Both of these categories are additional, not major, so SciLab is displayed under "Other".
A better behavior would be to have an option in the Settings Manager "Show all categories of installed applications". When this option is selected Xfce4 would show all categories are associated with all installed apps. In the case of SciLab it would remove Other and add Science and Math categories.
Users with a lot of apps in categories that aren't considered major would benefit from this feature.