The first step is to realise that you can use system to execute your existing scripts without changing them at all:

#file sample.pl

system "noname1.pl first argument";
[download]

#file HelloWorld.pl

my $arg = shift;

print 'Hello World.';
print " param is $arg" if defined $arg;
[download]

Prints:

Hello World. param is first
[download]

After that using any of various methods to get the list of scripts to run and using that list to populate a list control is fairly straight forward.

I've not time to do it now, but if you don't get enough answer to do the GUI bit I'll provide a sample in a few hours.