would

I saw somewhere that the sign for "would" is a "W" at the chin (palm towards the face) pulled back an inch or two then changed to a "D." Any comments on that? ( I don't see a "would" signing in the ASLU Dictionary section. However, I was thinking that if we can sign "Should" [by signing "have to" twice], then we should be able to sign "would." But what do I know, right?)

Dear Student,
The sign you describe is used in Signed English.  It is not used for conversational ASL.
In ASL, the concept of "would" is often expressed indirectly in ASL. Or you use a sign that reflects the intended meaning.

For example suppose you wanted to say:
"I would like to see that movie." 
You would sign: 
"I WANT SEE THAT"

"I would like you to come" = "I WANT YOU COME"

"I wouldn't know" =  I DON'T-KNOW

"I wouldn't mind if you..." = "I DON'T-MIND ..."
"I would never go there" = "I WON'T GO (negative head shake)."
"Who would like one?  I would!"  =  "WHO WANT?  "raised hand"