I know I for one will not allow players to get better than +3 unless it is temporary and situational. Giving a +1 in DW is so much different than in a D20 system. The spread of rolls is small and bell shaped. A +1 affects rolls so much more. Have not read Beta yet, but I will be interested if there is inclusion of magic weapons (with pluses to hit). In my campaign, I prefer strange powers over dice modifications.
Yep, that's in the equipment section for magic items. Pluses to hit and such are "in the realm of the mundane."