We are also interested in this, it seems like one major difference between Visual Cron and some of the other similar tools on the market, most other tools support MSMQ (although they are also more expensive).
The MSMQ API is very easy to code against so I would hope that this can be added in the future. Initially just sending of MSMQ messages is sufficient but reading queues would also be good for the future.
Thanks,
Alex