Feature request: warnings
Given how central Pakon promises to be for parental control (hence the name), I suspect a key feature into the future will be a warning system. That is a way of configuring it (if through config files or web UI matters little to me) to send a notification (the standard Omnia notification mechanism suffices for me as I get them emailed to me anyhow, but you could support other notification methods) when a client (matching a given RE) visits a host (given an RE). And/or provide easy access to a standard list of "unsafe" sites ... which must exist already somewhere - known sites not safe for kids. Of course there may be different sites for different age groups. But one imagines for example we might see pornhub on all of them ;-).
In any case, some means of configuring notifications when children are accessing dodgy material is a good thing.