Its not surprising to me that you have found your code suitable to your programming style and thought processes. The real question is, how many other authors find your method factories suitable to their programming style and thought processes. And if every one of us with a custom method factory that we prefer uploaded it to CPAN there would be hundreds of such modules, all slightly different, and all the more useless as the difficulty of figuring out which is The One To Use would become all the more intractable.
Anyway, I should add that releasing such a factory as part of the Rose framework is to my mind totally fine. You arent advertsing it as a generic method factory, and you aren't suggesting that people outside of yourself should use it for anything not Rose. Which seems to me on an abstract level to be about the same as DDS where i have about 10 lines of code that do method generation. I didn't bother to stuff it into a seperate module because DDS isn't a framework. But to me the two are both just utility code used to make our own lives easier. They arent intended to make anybody elses life easier, which is good, because they probably wouldnt.