Absolutely! This has always bugged me...I insert blank lines and need to correctly select the line in order to then reduce or increase font size, which then changes the visible spacing. Not something we should have to do. Please consider this feature, my TechSmith friends. (And while you're at it, please consider adding tracking—letter space—controls, too. If you have to choose between the two, leading is way more important.)
This is a really, really basic need, Techsmith, because it's common to use more than one line of type on screen. As per luckylindy, the vertical spacing needs to be addressed first. Other typographic controls would be nice, but the lack of this one creates a lot of extra work for us.