I don’t see why you can’t make a keyword a phrase instead of one word. Maybe I am oversimplifying it but it works for me. I would have keyword phrases like these for example.
Joseph laughs
Sam cries from rejection
street cat
dog in car
If you want to be more generic you can use one keyword for all the laughs and put that on a folder entitled laughs.
These would be keyword phrases. Remember you can also use folders to put your keywords.
A folder for Joseph’s keywords
A folder for the dog keywords
A folder for Sam’s keywords
For me this works. I am not saying there is not room for improvement like the searchable markers. I use markers for different things like change of a person I am interviewing or change in location not for specifics of the interview.