After discussing this with Nick, we decided that what a user would most like to be able to set is how much time to allow outside the chosen peak integration boundaries. The only reason we choose a constant time range in scheduling is because this decision must be made a priori. So, instead of having the time controls:
Maximum time range:
[ ] Peak width relative
We should have instead
Maximum noise time range:
Which should also have a tip that pops up when you hover the mouse cursor over it that explains that "noise time" is the time outside the peak, and that the range is distributed evenly on either side of the peak. i.e. a 2 minute noise time range results in 1 minute on either side of the peak for a total of 2 minutes of noise (outside the peak) time.