Rating and Labeling jpegs, displaying ONLY RAW images, filenames in bottom bar

AHA!  I read the information for the preferences and read it wrong.  I put IN the extensions I wanted displayed in the "Additional RAW Extensions" because I thought "Ignore extensions when file browsing" meant it would "ignore" the extension and display the files.  My mistake. 
Since I never shoot RAW+JPG, I"ll try changing the registry value to see if that displays and lets me set ratings and labels for jpegs.
For the long filename problem - up 'til now the folders I've been using have been temporary for doing culling.  But if you're limiting the size of the folder as you are the size of the filename I"ll run into the same problem with the folder once the images are in their actual home...  If you ARE going to limit the size of the file to such a small space, can you have it use the same convention as elsewhere and display the beginning and end with the file extension and the "..." where information is truncated in the middle?
Is there any way to have FRV display a full filename (folder and file) unobtrusively in the image window - similar to what Bridge does in the slideshow so its possible to easily see?  I can get by without seeing the other information I'm used to having display with the filename like the exposure information (which is really useful when shooting close-ups at different apertures), but it would be nice to see filename so I know what's in the image group.  In Bridge or Lightroom I can select a set of images in the filmstrip so when I do the full-screen display only those images are presented, but I can't find a way to select a set of images in the FRV filmstrip.
 
 
 

Lexa, thanks for the suggestions.  I've reconfigured so it's a little easier to get better information while going through the first pass of image culling.  FRV works well with my workflow since my first pass is typically done at 50 - 100% to see if the image is sharp where it needs to be.  Any that aren't are marked to be deleted later and figuratively removed from the set by no longer displaying them.  Then a second pass is done on the remainder to check composition, exposure, and the other parameters used to determine which images should be kept.  During that pass, images are given a rating to indicate whether or not they'll definitely be edited and a rating to show what type of image they are (normal, HDR or PANO, B&W, special, etc).
By the way, I haven't found a way to show all images EXCEPT those with a particular label or rating, nor have I found a way to show all the images in a folder WITH a specific label or rating.  Is there a way in FRV to select a subset of images by label, rating, or other piece(s) of xmp data such as camera body, lens, focal length, ISO aperture, etc, so that only those images are visible in the filmstrip?
Unfortunately, I've now hit an actual problem...  I changed the registry to allow me to do labels and ratings on jpegs.  And I went through a couple folders of images, labeling those to be deleted later as "Trashable", and rating those definitely to be edited as a "1".....  Both show up fine in FRV.  BUT, the ratings and labels aren't embedded in the jpg file.  FRV is creating XMP files, which as near as I can tell don't get read by any of the Adobe products.  Bridge has no idea what the labels or ratings are on the jpegs, and neither does Lightroom.
I suspect there's no way around this in the current version of the product, and you may elect to keep the product usable stricly for RAW images, which will be useful for me under MOST conditions (other than the specific situation where I'm shooting series of images for high-focal-range "image stacking" I shoot RAW 99% of the time), it means I have to remember not to use the tool in those situations where I'm not dealing with RAW files...