Change how empty route heights are calculated

Don Ferris III suggested (via Mountain Project):

What if instead of hard coding a value for the route heights you just averaged the existing height values per given style then substitute the blank values with that.  Multipitch would be that averaged value X number of pitches. Perhaps you could even pull the height from nearby routes but I'm betting that would be a bit ridiculous.  

I think the averaged route height for a pitch being calculated based on an average of other routes they've climbed in the same style would be a great feature for the app. The nearby routes thing he mentioned would be great as well, but would be a huge addition, and probably more work than it is worth, given the nature of the app.