The only way of gaining 1 skill point is in quest The Dead God, but it requires INT4
Edit: theres another skill point to gain from Oracle in Ark of Lothasam. Need to pass test, INT3 I think
About Stealth and Sneak Att, in order to make your Rogue more agressive, Stealth II and Sneak Att I is enough, no need for Smoke Bomb (at least until enemy regen speed is lowered). This way you save 5 skill points
However Sneak Att may be useful with strong mobs like Vorators and Giant Hills. You use your companion as bait, then walk around and use Stab in enemy back.
The only skill a Rogue can learn that requires Warrior Guild membership is Heavyhand that is cool, but dont worth it
I suggest spending 1 point in Body Development. Bloodlust could be good to fight hordes, but Assassinate III is also used this way. I think Flurry goes well with Prec Strike and Mass Crit
My Rogue is lv 16 now and i consider paying to erase my skill points and redistribute this way
Stab IV (for 9 sec cooldown)
Evasion III (90% chance)
Stealth II
Sneak Att I
Flurry III (75% speed)
Assassinate III (50%-75% chance of insta recharge)
Body Develop I (my Rogue gains 30 hp, works like 1 END point)
In next levels i spend points in Prec Strike and Mass Crit. In lv 19 i get PS II and MC II. Maybe, in lv20, 1 point in Bloodlust
OR I just get PS I + MC I on lv 17 and Smoke Bomb on lv 20.