To go from:

The only way to do this in the latest version (3.4.0) is to change the source code.
In particular, in line 6297 of an undetermined source there is a function
compareEventSegs: function(seg1, seg2) {...
To reverse the sort order of events, simply change the order of the parameters in seg1and seg2around:
compareEventSegs: function(seg2, seg1) {...
Similarly, for the source you are looking for compareEventSegs:function(t,e)and do the same.
Please note that this will affect ALL views.
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