Thoughts on mysql thumbnail cache

Hey guys

I just updated all my toys to nightly frodo build (2x laptops, revo3610, atv2, 2x iphones, raspberry pi) and using mysql to manage the library.

I have some questions about thumbnails, but before I ask I want to establish my understanding of mysql and frodo:

-The mysql library keeps the thumbnail location.
-The xbmc client caches the thumbnails/fanart as needed
-The client saves the thumbnails / fanart to .../userdata/thumbnails
-The client compresses the image to dds
-After caching the client loads the thumbnails from .../userdata/thumbnails

I would guess a local dds file would load faster than a centralized share thumb folder as was used in eden, but I have two questions:

-After making the dds does that xbmc client ever have to refrence the original jpg? (I ask because i use Unraid and it would be bad if it would have to turn on all the hard drives when i would load the movie list. Movies are kept in /disk1/Movie1.... /disk2/Movie142 ... /disk3/movie456...etc)

-Now for the biggest question: Is there any way to force a xbmc client to cache all, and make dds of every thumbnail in the database?

Thank you all.. cant believe how exciting xbmc still is after all these years