It would be a really useful feature to be able to highlight text in Storyist.
My work is proof read and sometimes the 'reader' will have a question about something in the text or change the grammar or phrasing without really knowing if the 'mistake' is intentional. If they were able to highlight text this would really help to speed up the editing process.
What would be really amazing - and I feel a market leader - would be if highlighted text could then be found using the same function as 'search/replace'. Imagine what a dream it would be for someone to edit, revise and alter work if t