I think it's time to give some love to throwing weapons and to those who would like to go that way with their characters.
The only race that have something for thrown weapons is the halfling race. The have enhancements to add +3 to hit and damage, but that's all. I will exclude Monks and Returning Shurikens here. Everything else (feats) is available for everyone so there's no gain.
I'll compare quickly a halfling with some other races we can choose. The class is fighter.
A Halfling start with 16 str, but most other races srart with 18, or even 20 . For 18, that's the first tier of your enhancements already consumed, and for 20, that's 2 tiers. That means a halfling thrower dosn't really have a +3/+3 bonus, but a +2/+2 bonus and even +1/+1 compared to the race that start with 20 str and Half Orc even have enhancements boosting their str which means the bonus is completely negated.
A Halfling who would like to take all thr throwing enhancements would have to spend a huge total of 24 action points for +3 to hit and +3 damage and a Half Orc would only have to spend 6 to be equal. I think it's time to review those enhancements and reduce their cost from 2/4/6 to 1/2/3 and maybe adding a fourth step, or each step gives a bonus of +2 instead of +1. Also I suggest adding enhancements tied to the Quick Draw feat. Something like 2 APs for an extra 5% attack speed with throwing weapons and then 4APs for another 5%. Something else that have already been suggested is a "Manyshot like" feat but tied to throwing weapons. The Brutal Throw feat was a step in the good direction, let's continue that way.
This would give the players an alternative that have actually some real dps because right now, someone who builds a throwing weapons specialist is mostly only doing it for fun because you're far away in terms of dps compared to anything else.
These changes wouldn't be huge and shouldn't take much dev time. Let's see what everyone else opinions about this.