Have you thought about using the likes of portable apps .. in conjunction with dropbox ? maybe
USB key with your ftp details / client of choice .. and away you go ... store the files on it as well with either xampp portable or something like that ?
Or dropbox and make sure you always have your files on whatever machine you go at ?
There have been one or two times I've wanted a code editor but for the most part and for sanity of having local copies / RCS in place it doesn't make sense too much to do live edits not sure if BK have a new file editor in place as I've not used it ...
I think the older hsphere systems had editors in place