If that comment was made towards my post, then you have misunderstood me. I have had plenty of experience with air rifles before I got my PAL, let me say I respect them just as much as real firearms.
I think a Bow and Air Rifle Exchange would do best because:
1) Air rifles should have their own EE section, they aren't really "All other stuff"
2) Bows and Crossbows aren't "hunting and sporting equipment" as much as they are a central piece to hunting or the sport of archery.
3) The "hunting and sporting equipment" exchange should be dedicated exclusively to the accessories needed for such undertakings.
I think that, combined, the two have similar laws affecting them. Seeing as this firearms forum is not entirely dedicated to either, a single EE board for both would do best. Besides, have a board for each would mean them being fairly empty.
Cheers,
Sand