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sched.scheduler.run() blocks scheduler and prevents the addition of new events until all events added before start will not be processed. Canceling does not work too.
Here is test script which reproduces the behavior differences.
Output in Python 3.2:
Adding
adding 0
added 0
adding 1
added 1
adding 2
added 2
event 0
event 1
start event
event 2
Canceling
Output in Python 3.3:
Adding
adding 0
start event
added 0
adding 1
added 1
adding 2
added 2
Canceling
event 0
event 1
event 2
Traceback (most recent call last):
 File "schedtest.py", line 20, in <module>
 s.cancel(e)
 File "/home/serhiy/py/cpython/Lib/sched.py", line 93, in cancel
 self._queue.remove(event)
ValueError: list.remove(x): x not in list

Here is a patch that releases lock for other threads.

Tests added. Please review.

Oh, I submitted wrong patch (it contained unrelated changes). Here is a right one.

If no one objects I will commit this next year.

Sorry for chiming in so late.
The patch looks fine to me.

Sorry, Chris. I have opened too many browser tabs. ;)

New changeset 467c46e312eb by Serhiy Storchaka in branch '3.3':
Issue #16165: Fix sched.scheduler.run() method was block a scheduler for
http://hg.python.org/cpython/rev/467c46e312eb
New changeset ac919a281643 by Serhiy Storchaka in branch 'default':
Issue #16165: Fix sched.scheduler.run() method was block a scheduler for
http://hg.python.org/cpython/rev/ac919a281643