Hi there,
Thank you so much for your interest in the Quill and for your constructive feedback. We really appreciate users like you who take the time to provide us with their thoughts and ideas.
Regarding your question about the ‘Set Selection’ feature, you can indeed select text backwards from a given point. To achieve this, you would subtract 300 from the start index. So, if you want to start 300 characters before your selected point, just add - 300. This will move the starting point backwards and include the previous 300 characters in the selection.
I hope this solution works well for you. If you have any more questions or run into any issues, please feel free to ask. We’re here to help!
Best Regards.