Ok, I'm back home, so I can start doing stuff. As for the bonus action thing: sure it would be nice, but what about people dual wielding thrown weapons? that just leaves them with a pile of dust;
No, given we're discussing tactical and mobility options, it still lets them do something that they wouldn't be able to do without the feat. Whether disengaging and giving a parting shot with your dagger, or taking a full move + dash and heaving a javelin as you close to melee. Note also that this additional bonus action attack is not an off-hand attack and so would get Str or Dex to damage, most dual-wielder's bonus attacks.
I'm actually thinking, rather than Bonus action, how about
Reaction:
When you are wielding a weapon with the Thrown property, you may make one attack with it at any time as a Reaction.
That allows you to get your extra attack out, but it also plays up the throwing weapon concept as being always ready. - You could attack as soon as someone closed to you, or tried to run away from you, or even just cast a spell near you.
maybe something more along the lines of whenever you make an attack action and use on thrown weapons, you may make an extra attack (per hand?), using throwing weapons.
That strikes me as offering nothing more than simply increasing DPR.
As for the enabler: I don't think many people will take a feat just so they can take another feat later; that may have been the case in 3.5 with feat trees, but as it is now with all the feats being "free standing" or at most synergizing, it seems like a big investment, especially with the limited 5-7 ASIs (and most campaigns end before you even get all of them, so... yeah). I am only looking at this from a feat perspective, since that's what you mentioned I'm sure treating thrown weapons as full fledged ranged weapons would have other consequences as well, but I don't feel like thinking about it now.
I mentioned that enabler option as being a possible subclass ability, or plain houserule as well as feat option. - Simply allowing a version of Crossbow expert and/or Sharpshooter feats to work with thrown weapons for example.
-Master Thrower
You specialize in using thrown weapons to harass your foes, staying just out of their reach and landing hit after hit on them.
-When you take an attack action and attack only with throwing weapons, you may make an additional attack with each hand.
Language needs tightening up. Do these have to be ranged attacks, or could a dual-wielder use this feat for additional melee attacks? What about non-dual-wielders? If one hand is holding a rapier, or shield, or torch, what form does the additional attack with that hand take?
-Whenever you hit an enemy with a thrown weapon attack, you may freely move up to 10 ft. You may use this feature up to three times per turn./Whenever you hit an enemy with a thrown weapon attack, their movement is slowed by 10 ft until the beginning of your next turn (this could kind of be a hassle to track now that I think of it)/Whenever an enemy comes within 5 ft of you, you may freely move up to 15 ft without provoking attacks of opportunity.
Does the "freely" in the various instances mean anything? if so, you need to define it. If not, you should probably remove it.
Does this movement count in addition to your normal move? Could you use this feat to move further than you normally could in a round by defining the ground as an enemy and throwing darts into it rather than Dashing?
Does the movement reduction stack? Do you see this as being possible to do with any ranged weapon attack, or only with a thrown weapon. Why?
The movement when an enemy moves within 5ft of you doesn't seem particularly thematic to thrown weapons. Indeed, it would make more sense for a ranged weapon feat given that most thrown weapons are melee weapons, and so their user doesn't really have an issue with being in melee range.
It should
definitely also cost the user's reaction, otherwise you could do this multiple times and be impossible to engage in melee.
-You do not suffer disadvantage on attack rolls using thrown weapons when an enemy is within 5 ft of you.
Seems like a pretty strong feat, one that most every character throwing would get almost by default... that might mean it's too strong, or that thrown weapons were realy
that bad they needed all this.[/QUOTE]