I agree with Chris and other 861 owners that room correction is a very important feature. Meridian promoted this capability when the 861 was introduced and has shown it. I, and I am sure others, purchased the 861 partially based on the anticipated availability of room correction. This was four years ago!
No doubt, there are installation issues. However, high quality room measurement systems are now available at a relatively low cost. The Smaart software from SIA is a good example:
www.siasoft.com . If you already have a suitable PC, the cost of the software, high quality measurement microphone, and preamp is about $1,250. This provides very sophisticated transfer function measurement capability that cost more than $50,000 only a few years ago. Further, SIA can do a driver to interface with the 861, as they have done with several brands of pro EQ units:
http://www.siasoft.com/links.html . It would be reasonable to require Meridian dealers that sell room correction to purchase a reasonably priced measurement system and to have some training.
Given the very long delays in introducing new products and features and the seeming orphan status of 861 room correction, I don't think that we will ever see this. It is really a shame because it is needed and Meridian has an obligation to do it.