I really wish the loot window had a indicator for total TT value looted, or better yet if a log of each item looted and its tt value was dumped to the log file(as well as a message for what you just killed).
Unfortunately all we have is manual addition.
But ya, like the above poster said, once you kill a lot of something, you basically can tell how much ped dropped at a glance. Assuming you clear your loot window after each loot.
And that's another feature i wish they would implement. Either auto close and reopen on each loot, or open a new window on each loot. Preferably let us choose between the 3, the way it is now, auto clear, or a new window for each loot.