That's what I'm doing. Soldiers with good throwing skills get a whole bunch of grenades and a bow. The bow is light enough that they can carry
a lot and then if the target is armored, you throw an explosive, if not you fire an arrow.
I agree that it is not reasonable to have too quick of a reaction shots with the bow. Which is why I made it take barely less time than the aimed shot. Conceptually, I see aiming as a non-negligible part of the time spent on aimed shots, especially with a bow where you need to factor in wind and curvature as well. The lack of aiming I think is represented well by the slightly lower TU cost, shorter snapRange (which in fact I have reduced to 10 for bows) and drop in starting accuracy as well. The effort to fire remains the same, or actually could be increased too since you have to do the same work but in less time, which is more tiring.
Looking at numbers:
Bow damage: 0.5 Throwing + 0.1 Str; Max of 0.5*100 + 0.1 * 80 = 58 damage
Longbow damage: 0.5 Throwing + 0.4 Str; Max of 82 damage
Sniper rifle: 30/36+0.25 Firing; Max of 60/66 damage
Reaper rifle: 33+0.4 Firing; Max of 81 damage
I am neglecting accuracy for all of those, since it is easy enough to get decent hit% with all (all have >100 aimed accuracy). In fact it is harder with the bow because of training oddities. They all are good for long range support, with the bow having the advantage of arcing shots but disadvantage of maxRange and using (lots of) stamina (making it much worse with smokey/mesh armor, otherwise great for long range gals). I also haven't seen yet an armor with +Throwing, whereas there are quite a few with +Firing.
Overall, bows seem to keep up with early powerful rifle developments but you can still improve a lot on those rifles (better rifles + possible variations in ammo) and they seem to have better synergy with armors. I think there might be more bows, but I don't know of them yet..
Finally, and that's the main reason for me, the gals are crazy mutants who use heavy weapons as rifles and are stronger/faster/better than humans, so I want the possibility of a "Legolita"
and I feel it doesn't unbalance the mod much, if at all. I'm happy to keep the changes to my own Piratez-mod and enjoy the discussion though!