Hi charles,

re:
> I've downloaded the beta and have attempted to create a custom theme, however there's
> two things I can't seem to change. I've attached a screenshot of the areas I mean.

The first one is in the theme editor under Side pane > "Command set background color".

For the second one, there isn't anything set up for scroll bars in the dynamic theme editor but you can set it in the theme's moi.css file using this (last scrollbar property set in the regular dark theme moi.css):

::-webkit-scrollbar-track-piece {
background-color:#777;
}

- Michael