I don't see how a stealth bar would do much good, I can only think of two abilities that require stealth. Depending on which spec you are, you may only have one, and it's probably useless to you.
PvP is actually a fast way to level, I'd image doing class quests only and pvp wouldn't take too much longer than a mix of quests/pvp/flashpoints to get to 50. Though money and gear may be a problem, so I'd suggest crafting some while you're in PvP.
One day, you'll figure out doing the most damage isn't terribly important in PvP. It's nothing special to mash buttons blindly attacking people for 15 minutes. Sorry.
A lot of decent information here, though 60 valor only takes a few days of Ilum farming now. I see too many people running around flaring their BM title yet are complete garbage players.
I haven't played other classes to see how easy they are to do the same things as I do on my Sin, but from what I've seen it's a steady maybe. That doesn't mean they can't be effective. Our burst damage is scary with relics and adrenals. It definitely seems a lot harder to play than some other classes. Talking from a pvp perspective here. I guess learning your role in warzones takes time as a Sin.
Ops took a pretty big hit, from a sustained damage dealing point. Maybe even too much. Though this doesn't stop the insane burst of hidden combo, vanish, do it all over again.
I really hope they do something about that before launch. Its pretty stupid to just leave it like that. Disabling countries from playing for 2 weeks, really pathetic actually.