If a bard takes the Moonbow Dedicate feat:
Moonbow Dedicate
Heroic Tier
Prerequisite: Must worship Sehanine
Benefit: You gain proficiency with the shortbow, plus you can use a shortbow as an implement for divine and arcane powers. In addition, you gain a +1 feat bonus to weapon and implement damage rolls with the shortbow. Increase this bonus to +2 at 11th level and +3 at 21st level.
and then takes the Battle Song Expertise feat:
Battle Song Expertise
Prerequisite: Bard
Benefit: You gain a +1 feat bonus to attack rolls you make with any weapon with which you have proficiency and with a wand or another item designated as a bard implement. This bonus increases to +2 at 11th level and +3 at 21st level.
You also gain a +1 feat bonus to the number of squares that you can pull, push, or slide creatures with your bard attacks and bard paragon path attacks.
Does the bard get a +1/2/3 feat bonus to implement attacks made through a shortbow?
It's obvious that the bard would receive his +1/2/3 feat bonus to weapon attacks, given that he has proficiency with the shortbow, but the Moonbow Dedicate feat does not explicitly make the shortbow a bard implement. The online character builder is not adding the feat bonus to implement attacks.
Follow-Up
Is there a better way to do a shortbow-wielding bard?
Best Answer
This actually does work together. Note the text:
The first part gives you a bonus to attack rolls you make with any weapon with which you have proficiency. The second gives you bonuses with wands or other bard implements.
Note that it doesn't say "weapon attack rolls." Instead, it says "attack rolls you make with any weapon." They're not the same.
Now, the rules for Weapons as Implements and vice versa:
You're making an attack with a weapon with which you have proficiency. You happen to be using it as an implement, but that doesn't matter- the text says you get the bonus with attack rolls made with any weapon, and you're making an attack roll with a weapon.
This issue comes up in a variety of ways in the game. For example, if you're using a Frost Shortbow, you could attach a Siberys Shard of Merciless Cold to it to do extra damage, which would work even when making an implement attack. If you're using a Weapon of Speed Shortbow, you make make a Ranged Basic Attack with it once per encounter as a minor action...even if the RBA is using the bow as an implement, not as a weapon.