A) The ability to clock two "tracks" simultaneously.
1) An advanced workout where one has planned the run using longer distances. For example miles at a time during a Long (Marathon) Run.
2) Also track, simultaneously, much shorter distances such as quarter miles using the auto-lap feature.
Allowing the above makes it easier to run according to the first option - using the Forerunner as your guide - while using the second option to analyze data in greater detail perhaps. Right now one has to program the Long Run with the .25 mile increments repeated a bunch of times. That's fine, except that one then has to recalculated averages over longer distances (covered by option 1 above) if one wants them as well.
This leads to the next feature request:
B) A field in the "splits" page that is user-customizable.
Here one could put any wanted formula based on the other parameters, and for example get a "performance per heart rate" value if one chooses to. So one could take speed / average heart rate, and get a value that shows ones performance for that distance.
If this was an option, it would perhaps also solve the first request (?).
m