I just upgraded to v.18.01 (out on Jan 2nd) and was delighted to find greater text-size control within the text filters!! First impressions are that it is very intuitive to select a fixed font size for text - great for adding subtitles of a consistent size.
By way of thanks to Dan and the developers, I just created this short video, of course using Shotcut! Thanks, guys, keep up the good work with this excellent software!!