Just what DVDs are you watching? We have R&B and Friends Seasons 1 and 2, and neither the tales you mentioned are included (nor, according to Amazon, are they in Season3). All of ours include the other cartoon extras like Fractured Fairy Tales and Dudley Do-right, etc.)
der Brucer
I have all three of the complete season sets (the show ran five seasons, and the last two have been held back for some reason.)
Anyway, Classic Media has released two volumes of JUST the complete storylines from selectedstories from the various seasons. It's called THE BEST OF ROCKY AND BULLWINKLE - Volume 2. The three adventures in the set are from seasons 4 & 5 which haven't been released on DVD yet.
The three tales were WOSSAMOTTA U., GOOF GAS ATTACK and THE TREASURE OF MONTE ZOOM. It's just the stories straight through with no interrupting cartoons or other filler. The first lasts 12 episodes or about 45 minutes. The other two are 8 episodes which last about a half hour each.