It this really useful?
I mean the auto-update at boot should be enough, I wouldn't want something using CPU in the background, otherwise I would look at having a daemon instead.

This is easily possible, I will look into it.

This was my original idea but I wanted to see how the statusbar worked without colours first.

This maybe possible, at the moment they are separate scripts. I maybe able to have another statusbar below with this on. However, the show current button grabs the "cat /proc/swaps" information live, whereas a statusbar may have to be refreshed.