Simple RAW for Pathfinder Thread VI: Return of the Red Die

[Elysiume]

A 112: Not innately, per the list of flail weapons in UE (and the bladed scarf). The weapons in the flail group are:

Bladed scarf: Exotic, two-handed
Chain spear: Exotic, two-handed
Dire flail: Exotic, two-handed
Double chained kama: Exotic, two-handed
Flying blade: Exotic, two-handed
Heavy flail: Martial, two-handed
Light flail: Martial, one-handed
Kusarigama: Exotic, two-handed
Kyoketsu shoge: Exotic, two-handed
Meteor hammer: Exotic, two-handed
Morningstar: Simple, one-handed
Nine-section whip: Exotic, one-handed
Nunchaku: Exotic, light
Sansetsukon: Martial, two-handed
Scorpion whip: Exotic, light
Spiked chain: Exotic, two-handed
Urumi: Exotic, one-handed
Whip: Exotic, one-handed

The only non-exotic flails are the heavy flail, light flail, morningstar, and sansetsukon. None of them are light.

If you use Effortless Lace, you can wrap it around a "one-handed piercing or slashing melee weapon" and then "the weapon is treated as a light melee weapon when determining whether it can be used with Weapon Finesse." This would give you the morningstar and light flail as non-exotic finessable flail-class weapons.