To coin a phrase, I believe this is a solution in search of a problem.
In terms of transparency, we've got the public announcement of when a motion will pass/not pass. In terms of transparency, we have the list of who voted yes/no/abstain when voting is completed.
I'm really struggling to think of why knowing a TB member voted at 2:53am (on any date in a 2-week period) adds to the greater good of FT. Some TB members will vote relatively quickly, some will vote in the middle, some will vote at the end. I've seen no great clamoring for time stamps by FT members.
I think FTers would rather TB deal with more substantive issues.
Cheers.