Bill
I woke up at 2 am this morning to let our wiener dog out to find a tree in the snow while I flipped through the SoC. I started with a reply... yawned, let the dog in, and came back to the post. My speechless state was more of a sleepy state and so I left it blank. The follow up post was a lame attempt at being witty.
Your suggestions are right on the mark, from my limited perspective (no racing experience, etc.). My "Dead Pedal" is not so much a dead pedal as it is a comfort item for a guy with long legs. For me, the foot movement between the Clutch Pedal and the Dead Pedal (on my set up) is easy, without problems of catching the shoe, etc. But, my pedal was made and fitted on the spot, so what works for me, may not be the right thing for another driver. In fact I know that at least one driver at Knotts (Eddie) had trouble with catching his shoe on my Dead Pedal and had to adjust where he placed his foot on the clutch to compensate. Even with a larger footwell area on an IM, there is limited space for a full dead pedal.
My inspiration for the "need" came from driving my VS (with the limited footwell on a pan based Speedster) from OKC-LA-OKC and other trips. With my long legs I found the traditional foot rest spot on the edge of the pan by the heat outlet to be too short (even with my speedster seats mounted flat on the rails). The alternative spot after an hour on the road was to lodge my foot on the pan beside the clutch pedal and risk catching my foot on the pedal edge in emergency situations. When the IM was built, foot comfort was as high of a priority for me, as was seat angle and placement. I think the solution works for me, after 9,000 miles, but for another driver my set up might prove to have the issues you pointed out.
From looking at cars with true (auto-cross or track cars) dead pedals I can see exactly what you are commenting on and suggesting to others considering one. The shoulder area, pedal height, distance and other factors are things to be considered. You have hands on experience driving high performance cars at the edge and I respect that and the knowledge you gained in the process. Also, I know that you think about efficiency in design and performance more than the average bear(from reading your interesting EFI Posts) when you add to or modify your cars, Bill. So, my blank post was also a reaction of starting a post and then thinking later (after the dog had whizzed). I'm almost always amazed at the thought you put into your posts (and your projects) and so, yes I was speechless.
I'm happy with my set up, but I'm using it for different purposes than a true Dead Pedal. But even at my level of use, I would probably go with the shoulder, as you and Dale suggest.
Occasionally Speechless and Sleepless in Edmond.
Jim
Narrow, but Long Feet.