Yeah, Miahn, I know what you mean but that's really no big issue. Can be even good, if you just want to chuck throwing axes at his shield to make it break.
After playing a 2h/javelin hybrid to lvl 30 (100 2h wpf, 140 throw wpf, 5ps, 5 pt) I can say it's still certainly viable if you use your shots tactically. I.e. throw if you have enough time and want to play save, or throw into big groups - this often kills one giving you a big advantage when outnumbered. It is also great at defending vs. cavalry. This is actually one of the things I dislike. Thanks to their slow projectile speed (probably) they get a huge damage vs. charging horses and it's a guaranteed oneshot, but you throw from pikerange actually (*). And they aren't great at defending teammates from cavalry, you can stick the two shots you have (yes you have 3 but no way are you fast enough to hit 3) into a paper horse and rider that's going sideways/away to you and still see him kill your teammate (and sometimes run around for the entire round making 10 more kills because it were just scratches) - nevermind that hitting the maneuverable horses with that speed and accuracy is quite hard in the first place. So yeah, add more accuracy and shot speed to javelins, but keep other buffs really small. The idea of a dedicated ranged who has to get nearly into 2h range to hit reliably is kind of broken anyway. If he is strong you dodge 10 shots and then move in to kill him and get shotgunned. A dedicated range user should use it from some range. But yeah, I've been lobbying for that for ages, so call me biased.
(*) And it's exactly the same for melee and axes. I've killed many people in 2vs1 with an axe, but in all of these instances I waited and moved close to throw the axe at them in the right moment. I always thought, well, great, but I could just have used a halberd with unlimited ammo for that. From longer range it is a terrible risk your teammate steps into the shot when you can't do nothing about it.
edit: Also, instead of reducing all stacks to 1 slot, rather make axes and javelins 2 slots, with more ammo. No huscarl shield rambo immune vs. cav please.