Looking at the specs, dynamic range is 123 dB. That figure makes me wonder if it really is an autoranging multi-ADC setup like Tascam, Zoom, Sound Devices, and Stagetec employ. Zoom F6 dynamic range is 132 dB using 2 ADCs; SD MixPre-II series is 142 dB using 3 ADCs.
It looks like it can only accept timecode from other Diety units, but an interesting bit from the Gotham video is that the PR-2 can be a timecode source via 3.5 mm TRS output. In theory, than means you could slave or jam sync it to units from other manufacturers, right? The F6 does timecode via 3.5 mm so it would seem like a perfect partner.
Regarding powering DPA lavs: the 406x are supposed to get 8V, so I wonder how compromised their performance is with only 5V. You'd probably be OK with loud sources if you use the 4061, but for what I record I would be concerned about increased self-noise and reduced dynamic range.
Why can't someone make a little recorder like this with PIP settings from 3-9 V (or more)? Sonosax had this figured out many years ago with the miniR82.