Hmm, yes, I think I understand the issues raised with such a thing. Maybe it isn’t worth the effort for the most of TBX users, I don’t know, but I was having real trouble editing code in the actual small inspector window, with a very narrow width and no support for scrolling, for eg. … I have some prototypes with +50 lines of “code” and it is complicated. So I am currently editing TBX rules in an external editor (BBEdit) using PHP syntax highlighting (works quite well, and is the one active in the image above). I just need to be careful since no autocompletion of variable names there.