tl;dr- give the finder the option to choose either a bottomless pit OR a chasm, magma pipe OR pool, cave river OR cave pool
The finder is really useful, but the menu layout is less than optimal, requiring that sometimes you must perform several entire searches with several minor alterations to settings in order to find what you want.
Specifically, this:
Say I want either a chasm or a bottomless pit and have no preference. I can't tell the game that, if I get a partial match because I chose one I have to attempt an entire search again trying the other.
Rather than have toggles laid out as:
Chasm: yes/no/na
Pit: yes/no/na
The menu should be constructed in such a way as to be
Chasm/Pit: chasm/pit/either/na
That really simple change of syntax, made for tubes/pools as well as chasms/pits just about doubles the effective usefulness of the site finder and makes it far more user-friendly, too. It is a far more natural and elegant syntax. It has absolutely no drawbacks to make it inferior to the current system, since it can still do everything the current setup does... it just does things the current setup can't do as well, as well as doing some of the same things with increased efficiency.
This would be a huge timesaver and a relatively simple change.
Basically if we want to screen for a Chasm OR a Pit... or a Pipe OR a Pool... we can't. It's impossible, the only option is an XOR which requires several searches. This alteration would remedy that.