[Bf-animsys] Weight Paint Editor panel: inconsistent copy behaviour

[Gaia]

hi all.

In the Weight Paint editor (in properties sidebar)
we have 2 copy functions with inconsistent behaviour:

- copy weight of active vgroup from active vert to selected verts

   This function is activated from the "C" button (PASTE icon in trunk)
   in the weight table. However weights are only copied to vertices
   which are already weighted to the samevgroup. So it is guaranteed
   that no verts get assigned to other vgroups whenthis operation
   is called.

- copy all weights of active vert to selected verts
   This function really replaces the weights of all selected verts
   by the weights of the active vert.So the selected verts are
   potentially assigned to more/less/other weight groups.

Now i can change this behaviour in 3 ways:

1: Never create new weights in target verts
2: Always create weights as needed in target verts
3: add operator option to control behaviour
     In this case i would add a new Option to the
     operator panel: "Add Missing weights"
     In this case what should be the default behaviour ?

Thanks
-gaia-