Implicit Exec using KService
With frameworks/kio!177 (merged) and frameworks/kservice!16 (merged) we don't need to manually specify the exec lines. When looking through the usages I have found 14 occurrences in Konqueror. Once this project depends on KDE Frameworks 5.76 we could drop these.
And while at it I also want to throw the discussion in if we even need to have these KCMs accessible from the application launchers. Because the KCMs are exclusive to this application this could make sense.