I'm glad to hear they are planning to add more features. I've been using Function::Parameters quite a bit lately, and I can say it's made a
huge difference in how easy it is to handle parameter sanity checking. I was disappointed to see what 5.20 implemented WRT signatures, but if it's being added to over time, I can deal with that.
Since much of this is back ported Perl 6 concepts, I have a lot of thanks for Perl 6.