Blocklist that prevents certain applications to be installed
If I got this right Malcontent blocks the installation of flatpaks based on the age rating but I would find useful if I can add the names of the packages on a blocklist so the non admin user cannot install those on the system. In that way the user have some freedom to install the applications that it wants without being able to install problematic apps.
Maybe even with regex support? You never now if someone could create a different flatpak repo with problematic apps so being abble to nuke it based on regular expressions could, at least, mitigate the problem a little bit.