Managed to, with LOTS of help from the Chrome OS Lounge the community, find a way to get Crate to see the filesystems on the USB and SD drives though clever use of symbolic links. Sadly had to go to dev mode for this.
Also I found a music player that works with local files.
Been nosing around to see if I could find a way to keep the mouse from stealing focus while I'm typing. Found something of promise in syndaemon, but turned out, for the moment, to be a dud.
That is what I've been up to. Apologies for the lack of updates.