Minor bug: certain properties under the "Settings" tab within the Q menu do not save

[FredWPx]

The following I've found to be not saving:
Screenshot Quality
Max Decals
Max View Distance

These all appear to be options configurable with a slider. Perhaps the slider is broken, or it simply doesn't save to a configuration file properly behind the scenes. The console does not appear to report anything when changing these settings, not even errors.