Would be nice to block TLD by country like cleanbrowsing.org such as russia .ru and china .cn etc...
As noted in this thread, we currently have this ability. Simply add the TLD to the whitelist/blacklist without the leading period. Our help documentation discusses this further https://docs.dnsfilter.com/docs/whitelists-blacklists
You can do that now, just add the TLD to the black list without the leading period.
I like this idea. I also like taking it a step further and be able to block by geo-IP blocks. Something like pfsense's PFBLockerNG where it can pull in custom blocks, and based on the result of the nslookup, interfere with the resulting IP address sent to the requesting client if it matches.
@Rick: Vote for that here: https://dnsfilter.canny.io/feature-requests/p/block-response-based-on-geo-location-of-destination-ip