I gave up on the IDE. I started using Atom which is a sophisticated editor I use for most of my programming. There is a inform7 context highlighting plugin.
I had some challenges around representation of headings and the IDE (still used for compiling) overwriting the file I was editing (as described here).
But these were largely overcome by adding a few rules in Atom to increase the size and font-weight of hedings. And the overwriting problem was overcome with this great suggestion.