This could be covered under issue 219, but I'd also be happy to see it on its
own. The ability to make the horizontal axis scale by time (rather than giving
equal space to each build) would be nice. In fact, I'd recommend defaulting to
this even if it makes clicking through to particular builds nicer.

(Also concerning 219, and I couldn't figure out how to make a comment there, try
to automatically determine sensible defaults for each graph rather than
requiring people to customize. It shouldn't be too hard to know when to use a
logarithmic scale and so on.)