This might be crude, I have been double checking that all my 32bit renders are not clamping by using the info panel. Just making sure I am not clamped at 1 in the highlights. Works just fine, I seek out my brightest white and just make sure it is holding info past 1. This method is fine to use, but is there a more efficient way to do this clamp check.
Obviously these are EXRs and dpx files I am reading and writing.