I haven't, because the last 18 months or so has been something that I can only describe as "not ideal".
I have also been working on a new project for the last few weeks (totally unrelated to domains).
When that is complete I "might" re-build seemly as an application in it's entirety, so an RSS feed might be a feature. But in all honesty it's not really something that inspires much motivation these days, as it kinda works as it is and rebuilding it doesn't really add any benefit (to me).
Adding something like an RSS feed would just make it super easy for a competitor to just hijack the compiling of data I gather. Most of the traffic I get is for the bulk whois tool, so I may decide to restrict access to that based on a tiered membership system.
The problem is there isn't much of a market out there for me to monetise, and most domainers are cheap-skates anyway (myself included)