Best way to link and run own perl scripts

I am currently upgrading our company TWiki to Foswiki. I had a lot of problems which could be solved by just googleing but there is one thing left: In the bin folder of TWiki we have some perl scripts, which have nothing to do with the wiki itself. These scripts are linked in the wiki like that:

[[http://hostname/twiki/bin/some_script.pl][Linkname]]

I changed hostname/twiki/bin to

%SCRIPTURL%/custom

for all occurrences and copied the scripts over to bin/custom in the new foswiki installation in hope that this would do the trick. But now I am just getting the "Missing or illegal web name" page from foswiki and realized that running scripts by serverpath is not possible with the current configuration. So what is the best way to do that? Security is not that much of an issue because it is only internal and not reachable from outside our VPN.

-- AlexanderHarnisch - 11 Sep 2015