noddie - 3:47 pm on Mar 18, 2007 (gmt 0)
We had at a former employee of mine the same problem in our R&D department...
What we figured out we'd do was to set up a "Ask R&D hour" which lasted from 1500 to 1600 daytime!
Other than that hour you weren't allowed to ask an R&D employee as much as what the time is!
It might sound Nazi, but it's worth it!