RM's critical buffs are for physical damage. So far, only Twinkle Magic, Fortunate Magic, and one of the Crusader's aura provides magical crit rate as a buff, some items provide critical rate increase as a passive too.
1. Yes, pretty much, a map dedicated to PVP is available.
2. Still has lots of players, and like I said, PVP's still around.
3. Depends on your class. Follow what Orange suggests.
4. Bow rogues are uncommon, you see more dual-wielding ones on PVP/ Guild Wars
5. 150, and no 6th tier classes, yet.
6. Bow rogues can be great in PVP because of range, but if any class can get close to you, you're good as dead, unless you're skilled.
7. No majins, yet.
8. For a farmer, start with an Entrapper (rogue farmer), depends on you whether elf or human, then have a Rune Master (elf mage) next for powerful buffs, and (optional) a Destroyer (fighter glass cannon) for that nice lvl 8 Fighter's Heart. Make sure you create the 3 characters in 3 different accounts because Multi-client instance is allowed.
iLoonie's post in Question about RM's crit buffs.. was marked as the answer