Sorry, I was being vague. Some how abstracting the function from what I was using for has made it less useful.
Where I use SafeURL() is for re-using input data as values in URL links as these values (as I've been using them) generally tend to be nothing more than simple text/email strings.
For example mycgi.pl was called as
http://mycgi.pl?sect=test
I would use SafeURL() on the value of 'sect' and use it to create new dynamic links
http://mycgi.pl?sect=test;page=22
So I guess the purpose of SafeURL() is to make the data safe to feed back into a new URL, but that appears to be specific to my use, and probably not of much use beyond.
Seemed like a good idea at the time :)
EscapeJavaScript() still has it's uses, unless CGI provides an equivalent function?