I wouldn't say mandatory. I've been getting by just fine in tactician with none of that, though battering ram does sound like a good idea. For the most part, anything that actually reaches my Ranger is quickly CCed by her. I did once have her stuck in a corner unable to CC the actual threats on the battlefield, so I do see a point to Battering Ram just to break through.
Ranged precision/farseer are both useful. With +80% combined chance to hit for 4 turns at the cost of only 2ap, even if your enemies are NOT CCed you can still guarantee hits with no PER. DEX is mandatory though just to equip high level weapons.
Useful, yes, it's just that you probably want to CC everyone in Tactician anyway, or just get that Bully proccing. Apparently damage modifiers are multiplicative, so a heavily modified crit with bully will apparently go a very, VERY, long way ( though I just speak out of examples of damage I read here and there ).
I still see a real point to having accuracy but it's probably best to have very high damage =) And anyway with a high score in Marksman you probably can get all you can eat.
Now the most important question... bow or crossbow lol
Also what would be good Talents for a Ranger?
Obviously bully, but what about Elemental ranger? etc
Weapon, I'd argue is up to preferences. Crossbows seem to have the best crit modifiers so may end up having the best rough damage output, while bows are generally "faster" to shoot. I don't have any Master skills so I can't really argue for now !
As far as Talents go...
Bully, yes, and I'd say this is the only mandatory talent, which is somehow good.
Glass Canon if you think you have a good handle on everything would probably be amazing. ( got Lone Wolf so I can't get GC ).
Arrow Recovery maybe, now that special arrows may be a lot more useful ( I barely shot any in Classic DOS ! ).
Hyperopia if you feel like getting better accuracy from a distance and switching to a melee weapon doesn't bother you when cornered.
Overall I'd recommend taking either defensive talents like everything that make you immune to some bad CC effect ( lighting rod, stand your ground ) or Stench or Sidestep.
Or just nothing and exchange them for ability points later.
