I’m working on something to that effect, and it’s likely to appear in the next update. Basically, the few available downloadable HDR demos I’ve looked at (which all seem to have an encoded peak white MaxCLL of around 1000 cd/m2) all look reasonable with a SMPTE 2084 curve that clips (with soft rolloff) anywhere between 600-900 cd/m2 (depending on the material being viewed), on a conventional SDR display. So, I’m probably going to add SMPTE 2084 as tone curve choice to the 3D LUT functionality, with user-definable clipping point. This will have the serious drawback though that it is static, possibly requiring per-content 3D LUTs, but provides an alternative to the gamut remapping of (e.g.) madVR HDR playback (the latter has the big advantage that dynamic remapping according to the metadata is possible, although I think this is not yet implemented).