I think I enabled _writing_ timecode info into rendered files (tested mxf) if you set timecode for your timeline manually - it should be respected. If you render selection of your timeline - timecode will be set at start timecode of your render position. if you render selection with already altered (via clapping icon) timeline - it also should work. I found you (sometimes?) need to hit 'align timecodes' menu item for refreshing asset timecode info.... but such action will mes up timeline if some assets had no real timecode info.... Anyway, try to test those patches and told us how useful (or dangerous?) they are... In theory I think this is good idea to get embedded timecodes into rendered files (rel. to your working timeline) , but may be you sometimes want zeroed tc in output files?