re: what o_e_l_e_o said: I like that idea but that would massively shrink the size of DT2. I guess that's not necessarily a bad thing?
Loyce crunched some numbers on that a few months ago. At the time, it would have shrunk the list of DT2
from 229 to 63.63 was probably a bit on the low side, considering we have 100 DT1s (or usually around 95 if you exclude the handful who are excluded). However, given the DT2 list has now
almost doubled to 434, if the ratios were to stay the same (I'm not saying they would, but as a ballpark) we would be looking at around 110-120 DT2 users, which I think is entirely reasonable.
I think you are far less likely to have someone who is trusted by 2 DT1s "doing something stupid" than someone who has a single inclusion, as per OP's concerns. It also gives you two users rather than one you can appeal to if they do - they only have to lose one of their inclusions to drop off of DT2.