So far I've fielded three questions about this configuration, so I thought I'd start a quick thread to explain my experience and get some other comments on it as well.
Firstly, I do not have an active system using a Derringer, MegaMidget Racer, or other 68000 socket accelerator in combination with an AdIDE. I have been told by others that this configuration works quite well. If anyone can confirm this, I would appreciate it.
Secondly, I can report that 1) the AdIDE *must* be under the accelerator, and 2) that the AdIDE does show up in the Early Startup menu's board diagnostics. If you put the AdIDE in the accelerator's 68k socket, it will only be available in 68000 mode. (This configuration may be useful, but I lack the imagination for these possibilities.)