When one clicks "view" in the subtitles tab, one gets a list of all subtitles and one can click on them and jump to them in the film. There are couple of improvements that would come handy:

1) A way to also quickly go to the end of subtitles (should be obvious to the user such a way exists). It would come handy when one checks whether subtitle covers something it should not (like an already burnt-in subtitle, for example).
2) It would be a blast if one could edit some properties of the subtitle: for "Text" tag at least VPosition", but also "HPosition" and also "VAlign" and "Haling" and possibly "FadeUpTime" and "FadeDownTime". Applying specific font adjustments (like size italics etc to parts of subtitles or the whole text would be nice too. But the positions would be the most importatn for me, as this is a feature that is used often and needs to be checked against the image, so is harder to do in an external program.