There is similar discussion about [pkexec <command>] in .desktop file and Alt-F2: https://bugs.launchpad.net/unity/+bug/957641
Possible solution is simple wrapper script like one of GParted (/usr/bin/gparted-pkexec). In case .desktop file will be removed it still solves problem with launching from dash.
There is similar discussion about [pkexec <command>] in .desktop file and Alt-F2: /bugs.launchpad .net/unity/ +bug/957641
https:/
Possible solution is simple wrapper script like one of GParted (/usr/bin/ gparted- pkexec) .
In case .desktop file will be removed it still solves problem with launching from dash.