AFAIK SkyBox SP3 is the only known example of the adverbial {motlh} .  I haven’t been following this thread closely, but has anyone mentioned the adverbial {roD} “usually, customarily, habitually, regularly”:

   roD 'oHvaD juHqo' ponglu' neH
   [Qo'noS] is usually referred to as simply "The Homeworld." (S27)

I checked and unfortunately neither adverbial is used in the paq’batlh.

Okrand’s use of the quality {motlh} “be usual, normal, standard” may be useful to the discussion:

  tera'ngan motlhbe' SoH
  You are an unusual Terran. (PK)

  nISwI' HIch motlh HoS Hal qengwI' naQ tIq je lurarlu'bogh 'oH
     tlhIngan nISwI' beH'e'
  The Klingon disruptor rifle is a standard hand held disruptor,
    attached to an extended power supply stock. (S14)

  qughDo motlh: pIvlob vagh
  Normal Cruising Speed - Warp 5  (KBoP)

  Duj ghajchugh vay', cha'logh boq'egh qav'ap motlh; chen qav'ap le'.
    ghajwI'vaD qav'ap le' yIDIl.
  If [ship is] owned, pay owner twice the rental to which they are otherwise
     entitled. (MKE)

--
Voragh

Ca'Non Master of the Klingons

From: Alan Anderson

On Fri, May 17, 2019 at 8:27 PM Daniel Dadap <daniel@dadap.net> wrote:

It seems the adverbial {motlh} was defined in KGT with just a gloss <usually, typically, as expected>, with no further clarification, and it seems to me that this could be read either as something indicating the usualness of the frequency or the manner of the verb it modifies, so I’m not sure where I got the idea from that it refers to the frequency. What canon uses, if any, have we seen of {motlh} as an adverbial, or of how to express that something happens in a usual manner?

Skybox SP3:

{'ejyo' luch rurbe'qu' tlhIngan Duj luch. HoS law'qu' luch law'qu' je lo' Duj nuH pat Hub pat je. motlh ray' luSamlaHmeH De' Qatlh cha' tlhIngan Duj jIH'a'. motlh pIm 'ejyo' Dujmey.}

"Klingon starship design is vastly different from Starfleet technology. A huge amount of the ship's power and technology is devoted to its weapons grid and defensive systems. Unlike most Starfleet vessels, the main viewer on a Klingon ship is usually overlaid with a complex target acquisition grid." 

-- ghunchu'wI'