Technically you have a small degree of HDR with the HLG color mode (which is also 10-bit like the dlog option) if you know how to use it in an editor, likewise a pseudo hyperlapse using the DNG photo files (plus you can't really grade HDR without a monitor that's over a grand in cost). And as far as more ISO options in dlog that's going to be rather unlikely since once you start deteriorating the quality, it doesn't make much sense to use it anymore.