Right now there are no Reg F trainers in a Reserve Force unit. None of the ones I've been part of for the past umpteen years at any rate.
Reg F staff are largely employed as either administrators (e.g., Adjt, Chief Clerk) or Ops Planners/Coord (Ops WO). Very few of them ever go out on weekend exercises. Some of the keeners do, of course, and they stand out as amongst the better ones.
I can't recall a time when a Reg F staff member ever delivered any training on anything. Oh, tell a lie, once we had a very keen Ops WO (PPCLI) who had a ton of combat experience and put the troops through a really good PWT 4 package, which they loved.
In contrast, in the UK, every TA Battalion has (or used to have at any rate) a Reg F training team of about 8-10 NCMs and a few driver/admin types, commanded by a Reg F 'Training Major', who plan and deliver alot of the training. Reservists deliver training too, of course, but there is always a strong core of regulars there to make sure everyone (including the Officers and NCOs) get good training. Unit COs are Reg F as well.
If there's one way to add value fast in order to increase readiness and retention, it would probably be to implement training teams like this in reserve units. (And not like the 10/90 scam, where they trained up a bunch of our troops then CT'd them all over to the Reg F when they were done
).