Have you ever considered adding tags to the guide

[marvins...@hotmail.com]

Recently I needed to capture information in a random manner. I then
wanted to filter just the bits that were related.

Funnily I never found anything that could do the job. I had to resort
to t spreadsheet. How painful was that.

Now if the guide had tagging how good would that be?
Possibly a bar across the bottom with a +/- button. To add and delete
tags.
Tags created would propagate downwards unless removed.
Then put little buttons with the tag name down the bottom on that line
so the use can turn them on and off.
Maybe a little tag filter on the top bar which would enable global
filtering on any tag in a guide.

just a thought