this is a very interesting proposal ! We are really interested to get the result you will find, of course.
Currently, we have no formal requirements, except that it would be great to be able to run those benchmarks on many different platforms/JVM/OS. (I was thinking about W$/Linux/Solaris, Java 5, 6 or 7, from Sun, IBM or Bea (jrockit), mono proc/ multi proc... Typically, we have a 8 way CPU available, with 9 injectors, on a 1 Gb ethernet, with all the mentionned JVM, so if the benchmark could be run on such a configuration, that would be just perfect.
Otherwise, I suggest that you post to the DEV mailing list your proposal, questions, results using a tag like [MINA bench].
This is an exciting proposal