[RPG] Weapon Finesse and touch attacks

For two-handed, reach weapons that you can use with Weapon Finesse, your options are basically spiked chain, and the drow scorpion chain (read: a slashing version of the spiked chain) from Races of Eberron.

Races of the Wild has several weapons that can be used with Finesse without being light, but none have reach. The lynxpaw is a double weapon (i.e. can be used as a two-handed weapon), and the elven courtblade just is a two-handed weapon. The elven thinblade is a one-handed weapon à la the rapier, i.e. it imposes restrictions on two-handing it.

Other rapier-like weapons include the ribbonweave from Races of Eberron and the quickblade rapier from Complete Adventurer.

The last such weapon I can find is the dragonsplit, from Monster Manual IV. These are one-handed but count as light for TWF and Finesse, and also have 19-20/×4 criticals. I’m not sure if they can be two-handed but since you’re not going for dual wielding I wouldn’t bother with them.

The spiked chain (or scorpion chain if you want slashing for some reason, or are a drow who can get easier proficiency) is far-and-away your best bet.

Alternatively, the feycraft template from Dungeon Master’s Guide II can make any one-handed weapon compatible with Weapon Finesse. It can also make light weapons use Dexterity instead of Strength without Weapon Finesse, which is often a bigger deal. I don’t know any one-handed weapons with reach, but the kusari-gama from Dungeon Master’s Guide is a light weapon with continuous reach à la spiked chain.

Yes. You can use weapon finesse when attacking with your finger as an unarmed strke and when using it to deliver a touch attack.

Unarmed Strikes (your finger) counts as light weapons and qualify for weapon finesse.

From the d20pfsrd page about unarmed strike (emphasis mine)

An unarmed strike is always considered a light weapon. Therefore, you can use the Weapon Finesse feat to apply your Dexterity modifier instead of your Strength modifier to attack rolls with an unarmed strike. Unarmed strikes do not count as natural weapons (see Combat). The damage from an unarmed strike is considered weapon damage for the purposes of effects that give you a bonus on weapon damage rolls.

However, This does not directly extend to making touch attacks. Touch attacks count as 'armed' unarmed attacks. Since unarmed attacks are considered light weapons, they qualify for weapon finesse.

http://paizo.com/prd/combat.html

“Armed” Unarmed Attacks: Sometimes a character's or creature's unarmed attack counts as an armed attack. A monk, a character with the Improved Unarmed Strike feat, a spellcaster delivering a touch attack spell, and a creature with natural physical weapons all count as being armed (see natural attacks).