Ideographic Description Characters

[Tom Gewecke]

Can anyone tell me whether ideographic description characters are ever 
actually used?  I recently ran into a Han (Vietnamese NÃm) character 
which does not seem to be encoded yet, "slice" radical on left and 
"heart" radical on right, and was wondering whether it would make 
practical sense to encode this as U+2FF1, U+2F5A, U+2F3C ( âââ).