I am sure this was covered, but having a hard time find relevant messages.

I would like to do several things.

1. modify existing definitions, i.e. add OFF as an option the set step command
2. have constructs like if then exoand to
if exp then or if exp then
code code
else end
code
end
3 Scan expand to
scan
code
endscan

but keep the existing tips if appropriate or change then if needed,

Any readable pointers appreciated.