I will try to explain my point of view - my question is on which point pseudonimity better then anonimity, if take a look from end point, a side that want to disclose your IP,
1) for example you are ecologist - sniffer side exactly knows that you are hiding, you don't need to appear ordinary, as you are not by mean - but same way each and every service on the way would see that your time zone is differ than IP - and blacklist you same anti spam-fraud-abuse system:) they will not sit with chronometer and count if you really just set this timezone by mistake...
2) those cases when exit nodes were exempted and even their holders abused by law, just because one of connected users was real browsed abuse content - same way as above, they not tried to look up abuser IP, they almost knowed it - and if they even don't know abuser real IP, so exit node holder already was abused instead:)
and in the middle of chain, which appears any system would it be windows or any else, there no time zone and no local IPs at all - connecting IPs have only IP - and even if has, workstation got gateway's IP's with UTC but no it's own, workstation has no own IP at all -
and of course when they see TOR IP they already know you are hidding, no matter why - so just setting time zone would give more real world appearence pseudo then just looking pseudo in middle of chain?