Editing model after unwrap UVW

I just made a character and already finished the UVW.

unfortunately when I add vertex on my model , the mapping automatically reset.

is there are any good way to edit model without reset the mapping I made before?

sry for my bad English:o

AFAIK adding a vertex is not resetting but altering your UVW mapping, since unwrapping is based on vertices, are you familiar with multiresolution?