Cursor position after insertion and disabling URL encoding

[Amanda]

I'm using MooEditable for a form that can include merge codes in the
format of {mergecode}. When using the prompt to add a hyperlink the
{ and } are converted to %7B and %7D, which isn't recognized by my
backend for replacement. How can I disable URL encoding?

Another issue I'm running into (in all versions of Firefox at least)
is that after inserting content, the cursor remains at the beginning
of the content inserted. Is there a function to move the cursor the
amount equal to the number of characters of the value inserted?

Thanks so much,
Amanda