My main database currently contains about 21K names. At one time (when I was young and foolish) I went through a period of adding GEDCOMs, willy-nilly, from undocumented sources like Ancestral File. In the last few years I've been taking some time to go through and document what could be proven and clean out what can, carefully making what's in dispute. I have a few proven gateway ancestors that lead into well-documented European linages and a few that are disputed or dubious. The ones that were completely bogus I've unlinked and deleted as best as I can. The problem is that this leaves many blind allies that still link back to various nobility which are valid in other lines.
For some time I've been thinking about ways to find people who are poorly documented. For instance, the only source citation is to Ancestral File, or there are no sources. The problem is that RM's find tool just isn't set up for that type of search. I can find records that cite Ancestral File but they may also have a dozen other sources. I can't just color code all the ancestors of "Bogus Gateway Person" because that would also color code many of the ancestors of valid gateways.
This has bothered me for a while and I've been more or less letting this sleeping dog lie.