If I may ask -- what do you need Perl 5.14 for that the default Perl does not provide?
I do not know what the issue could be on 1and1. They might have specified an option somewhere that forces all scripts to run with their interpreter.
Perhaps, though, what you could do is cross-compile Perl on your own computer, for the 1and1 server. Find out the arch of the server, and then specify that when you run the configure script in the Perl dist. Of course, this is assuming that the server you SSH into is indeed the same as the one that executes the Perl script. On some hosts, this is not so, and your scripts will refuse to execute, leaving an error message in the logs about "cannot execute perl".
Usually, if you need more advanced choices, then shared hosting is not the best decision. Perhaps a VPS will work better in your case.
confess( "I offer no guarantees on my code." );
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