Dragon Timer
I like it when the timer wasn't handed to the opposing team. To work for dragon and to be rewarded with the timer for winning dragon seemed right. And to try your best to guess when dragon spawned if you didn't have the exact timer seemed right.
I'd propose that dragon timer is only revealed to the opposing team if someone who receives the dragon buff is visible. If dragon is slain and no one from that team is visible at the time of the kill, then the timer should remain hidden.