Hi, this is great feedback, thank you so much! I love your idea with showing which way the position will shift, will definitely consider adding it to the tool.
As for the scales, any suggestions which ones I should add next?
then id suggest taking a look at what other sites suggest for, "10 most useful guitar scales" or whatever for some fun variants you haven't covered yet.
oh, and it might be cool to have a mute button too — maybe i want the visual reference of the site but to put on my own music in a different genre or something.