Idiot's guide to creating a new style - or inset?

[Nick Bell]

Dear LyXians,

Despite doing my best looking through the wiki and email archives, I'm 
stumped, and I think I'd better ask for help.

I'd like to use \textsuperscript{} and \textsubscript{} (available in 
the KOMA-script classes) to generate 'true' super- and sub-scripts. I 
can do this with ERT of course, but it looks ugly and interrupts the 
flow of reading.

Is there a way in which I can add a new style (?char style ?inset) so 
that all I see of the \textsuperscript{XYZ} is the parameter, i.e. XYZ 
(perhaps in some particular font).

I think I need to be creating a new InsetLayout, but I don't know 
exactly what to put in the file or where to save it for it to be 
accessible as a module.

I know that documentation for this is coming soon but I'd like to learn 
as soon as possible.

Many thanks

~Nick