1. The bonuses for putting skillpoints in dual wielding seems weird for rogue type characters seems weird. +damage is ofc nice, but the +crit seems completely off. If you plan to take backtab you are going to be using a weapon that works with it, that means a 1h weapon, and that makes dual wielding two 1h weapons very likely.
But whenever you do backstab any bonuses to critical chanse from points in dual wielding is completely wasted since you are guaranteed to crit anyway.
2. How are spears intended to be utilized in this game?
I kind of like that they were made a finesse weapon. But this means that if you really like spears as a weapon you cannot really build a good set of skills around them.
You can ofc use warfare skills, but they will do less damage with a spear than they would with a two handed sword with identical stats since warfare skills are boosted by strength and not finesse.
On the other hand finesse based skills do not support fighting with a spear. Scoundrel skills that are based on weapons are all based on daggers, and huntsman skills are (as is reasonable) all based on ranged weapons.
1. You have cool downs, so you will be auto attacking at some point, also Savage Sortilege in the event that you're hybrid.
2. Spears seem geared towards warfare/scoundrel builds and have the advantage of higher crit base; use the warfare skills that are mainly in the domain of movement, buffs, and weapon damage. For Scoundrel use the ones that involve buff and movement. I am pretty sure you can still utilize Guerilla. Your gear will be more or less the same and you'll be aiming for a dodge build type ... thing.