I have three proposals regarding tags:
An old and forgotten tag with a grand total of 4 one-shots and 1 series to its name, and imho neither useful nor descriptive: What's "moefication" even supposed to mean? All possible meanings are already covered by Anthropomorphization, Chibi or Moe up the butt? And I couldn't tell why Junjou Eccentric Honey Face is on the list, but something like Tuna-chan Wants To Be Eaten isn't.
Just take it behind the shed to avoid future confusion.
Add Perverted Heroine, Depraved Lesbian or something to that effect
Anything that covers a major character operating on the logic of an ecchi harem protagonist. Examples would be My Friend's Abnormally Cute Sister and I'm Way Better Than Him, Right?. This trope is usually in the overlap between Ecchi and Comedy, but not filterable in particular yet.
Marking such stories is a strong deterrent (for people who want to read a "serious" romance) and compellent (for people looking to read a fun romp) signal. Idk if the "10 occurrences" thing is actually a hard rule, but I'm sure we can satisfy that with some searching.
Add a Leash, Collar or Petplay tag
Petplay suggestion from 2024 | Petplay suggestion from 2018 | Debate about BDSM-ness from 2019
Rationale: the BDSM is being diluted with the very common kink of collaring (which seems to be perceived noticeably less "hardcore" than, say, paddling). That's both disappointing for people filtering for and filtering out BDSM.
For example, tagging Beware of Dog BDSM (it currently isn't) would be imho misleading, yet Chisato leading Takina around like that is the major appeal of the story.
I know rolling out that tag might seem daunting, and after the 49 Bloodshed suggestions from last October (not doing that again), I have prepared a 177-entries long annotated list of applicable targets to get you started and can share it as plaintext, JSON, CSV, custom XML or a haunted Minecraft world with Book and Quill in chests for each entry.