Caught your memory mod in Monitoring Times this month.  I would make the 
circuit simpler:
  
Pull up pin 19  - just like you said...
  
Put a 10K resistor from pin 19 to 24 - the +5 V line...
  
Put the switch between 19 and ground.
  
It saves a component, cuts the "flying tie points" by 50% and makes for a 
neater installation.
  
You are free to distribute this mod - it's standard industry practice.
  
I might place a .1 uFd chip capacitor between 19 and the pad below it if I 
were really going to get fancy...
 
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