Hehe, when referring to the item creation rules, I was thinking more about calculating costs, rather than which creation feat applied. So the Javelin of Lightning example is certainly pertinent in regard to feat selection. In fact, its the only example of this type we have as a precendent that I can find. Personally, I can argue that the javelin is not really a weapon at all, per se. Not only is there no bonus, there is no attack roll required to use it at all, just a reflex save DC for the target. Its really just a single use spell activation item. Obviously, though, if I rule that its really a wonderous item, I'm making a house rule - so for the sake of argument I'll accept that the rules indicate feat selection based item's form as a 'weapon'.
As far as DM approval required for new magic items, I kinda figured that went without saying, lol. In fact, existing items in the DMG are still subject to DM approval, as far as I am concerned. I was approaching this from the POV of a DM deciding how the item could be created within the existing rules. Personally, I think there should be more vareity in the kinds of enchantments available to weapons and armor, so I have no problem with a little mixing and matching. The main thing is to keep control of the item cost, make sure the form follows funtion (i.e., no Boots of Minute Seeing), and that there is no feat abuse. For example, my Druid player wanted to use his Craft Wonderous Item feat to make an item that reproduced the effect of a potion (he does not have the potion creation feat). I told him flat out that even if I did allow it, the effect would either be reduced or the cost would be significantly increased, compared to the potion. Otherwise, why would you ever take the potion creation feat? (This is another reason to question the Javelin of Lightning, as written.)
I do think that the example of making a wand in the form of a weapon really crosses the line, and I would never allow that in my game. Rings, wands, rods, and staves all have very specific descriptions and forms. A durable wand that doubles as a quarterstaff would be a bit munchkin IMO, unless it's cost was adjusted significantly.
