I want to create duration overlays in typical HH:MM:SS format, like YouTube. But there is no option to have runtimeH or runtimeM be zero-padded by PMM. Adding zero-padded versions of these variables would greatly increase the versatility of duration overlays. Maybe one could name them runtimeHH, runtimeMM. Also, there is no runtimeS, and certainly no runtimeSS (or however one would call it).

Example (in case I am talking nonsense above):

I have a 1 hour and 2 minutes long video to generate an overlay for.

text(<<runtimeH>>:<<runtimeM>>) leads to overlay text "1:2".

text(<<runtimeHH>>:<<runtimeMM>>) should become "01:02" instead.

Having seconds (both in zero-padded and non-zero-padded flavours, of course) added would be very handy too, but I can live without that if it is too much effort.