Window Select Surfaces in Thicken Command

[#1]

It would be nice to be able to window select surfaces for use with the Thicken command. When shell fails, I need to resort to thickening individual faces. This is a laborious task when 100's of faces are involved

[#2]

Offset and Thicken use the same dialog so we need to do both [US4619]

[#3]

Accepted idea [US4619]. Thanks!