I think this has already been discussed and the consensus was that it would be unnecessary (?)
I honestly don't recall it being brought up, but I might have had the new forum software section blocked or something.
No, it's not necessary but I think it's a great idea. It would be a nice thing to be able to see what the price is when I'm posting in Speculation. I don't check preev all that often and I find that I have to before I write something speculative. Not all suggestions have to be necessary in order for them to be good, and I think this is a good one.
It would be nice to have. Even better would be configurable trading pairs. User choice to see BTC/USD or BTC/Pesos, or even something like USD/BTC and ETH/ETC, etc.
Sure, why not? Unfortunately it's not up to us plebians, but Theymos--and I don't know anything about the forum's software and how difficult it would be to implement a ticker. I do hope he considers it.