If that's all you want then:
Remove all properties from:
Start Menu > Panels > Basic > Programs List > Panels > Programs List
Start Menu > Panels > Basic > Programs List > Panels > Programs List Extended
Start Menu > Panels > Basic > Programs List > Panels > Programs List Separator
Now add the properties
WIDTH:INT of 16 to Start Menu > Panels > Basic > Programs List > Panels > Programs List
WIDTH:INT of 5 and HEIGHT:INT of 2 to Start Menu > Panels > Basic > Programs List > Panels > Programs List Extended
WIDTH:INT of 4 and HEIGHT:INT of 10 to Start Menu > Panels > Basic > Programs List > Panels > Programs List Separator
Remove all properties from Start Menu > Panels > Basic > Programs List > Controls > More Programs Arrow
But there's a lot more to making the JumpList look right. Also I'm not sure how this will affect your Start Menu if you have one
Also so far I haven't been able to save anything to a 8 msstyles in 8.1
Here's a map of how to do it with an 8.1 msstyles in 8.1:
http://vistastylebuilder.com/forum/index.php?topic=1986.0