Maybe I'm just blind, but is there anywhere in the 4e PHB that deals with having multiple magic weapon properties? i.e. Can you have a Flaming Dancing Shortsword?
Havn't seen any either on my 1st quick read-through
One could probably calculate a special effect's level equivalent (by substrating the value of a straight +1 to +6 from the level) to create your own multi-fonction items though.
Well if you look at the flaming and dancing weapons, they are always at +4 levels than their basic magic counterparts. I havn't checked every item to make sure it is so, but that would indicate that the "flaming" is worth 4 levels, period.
When I have more time I will check the math for all weapons n armor to see if it works for all items or just the flaming and dancing ones.