Edit countdown parameters?

I'm trying to create a countdown video similar to this (https://www.youtube.com/watch?v=RhN1nTAHTdg) with the time format "mm:ss". I found the countdown generator by going to Project>Generators>Countdown, but the video only seems to countdown in seconds, not minutes, and there doesn't seem to be a way to edit it when I double-click on the file in the project tree.

Does anyone know how I can get it in the mm:ss format, instead of just counting down in seconds? Or, is there an easier way to generate the kind of countdown I'm looking for?

Thanks in advance.

(Running kdenlive 0.9 on Ubuntu 12.10 64-bit)

When you create a countdown in kdenlive, an MLT playlist with pango markup is generated in your default media directory (~/kdenlive). To generate a countdown with the appropriate format I wrote a python script, which I will upload as soon as I get the chance. The basic psudocode looks something like this (I don't have the exact XML on hand, but that's easy to fix):

For minute in range(5):
For second in range(59):
Print """
""" % str(minute)+":"+str(second).zfill(2)

Should generate a count up timer from 0:00 to 5:59. A countdown timer would just need the appropriate argument to range():

For minute in range(5,-1,-1)
For second in range(59,-1,-1):
Print """
""" % str(minute)+":"+str(second).zfill(2)

I'll upload a working script when I'm home.