The short cap does create a blind spot that bothers my wife when she needs to drive it so in the grand scheme I'll probably have something to share about that mod before long.
My wife dislikes the non-window cap on mine for the same reason. Happily she dislikes a heavy diesel with a man trans even more so it's rather moot. As to "blind spots" I have had very good performance from modifying stock mirrors with:
Blind Spot Mirror Specialists - Safety Mirrors Online.com
Takes about three days to get used to. The larger the mirror the better as "distortion" is lessened.
No more looking over your shoulder to check blind spot!!
Keep it rolling BZP!