I did. hippo said:

'However, the good news for you is that Perl is open source and uses the Artistic Licence. You may fork it and convert it to use a different default encoding. You could release this as uniperl and all the folks who agree with you could download and use it, just like they can with rperl. Best of luck with it!'

Which is 100% true, you could go down this route, you could fork perl and do what you want. You seem to have focused on a single 'you shall not' from rperl, which is specific to their implementation (and would be totally unrelated to your potential perl fork) for performance purposes. This does not negate anything that hippo stated, despite your assertions to the contrary.