Your suggestions are good, but I think they are mostly answered. Or is your point having it in the dictionary as a new chapter?
Thanks! I think indeed that it could be useful to have a reference to it in TKD.
1. Imperative of state / quality verbs with *-'eghmoH*.
Explained in short KGT p. 117 See → http://klingon.wiki/En/EghmoH
I was actually thinking on discussions such as this one: http://lists.kli.org/pipermail/tlhingan-hol-kli.org/2019-March/030748.html
2. How do appositions work in Klingon?
I'm not sure if ever canonically explained, but deducted from canon examples, summarized here: See → http://klingon.wiki/En/Apposition[http://klingon.wiki/En/Apposition]> [http://klingon.wiki/En/Apposition[http://klingon.wiki/En/Apposition]]
It would be however cool to have some canonical explanation about it :-) (See also for example the discussion here: http://lists.kli.org/pipermail/tlhingan-hol-kli.org/2022-September/082293.ht...).
3. When isn't *-lu'* necessary in purpose clauses when expressing an indefinite subject?
I'm not sure I understand the question. Can you give examples?
As far as I know, when a purpose clause modifies a *noun*, there is *usually* no subject and no *-lu'*, but there are (unexplained) exceptions to it. See for example the second point here: http://lists.kli.org/pipermail/tlhingan-hol-kli.org/2021-July/058919.html).