At this time, it is not possible to generate a custom URL and/or a link alias with Screencast.com. However, this is an interesting suggestion, so I will bring it back to the team. Can you share a little bit more about how/why this would help you? Is it something you would like to use with individual videos or is it useful for folders and playlists, too?
The general idea is that I am sending invitations to people to view my training videos with the link produced by Screencast, which is essentially meaningless to the people receiving the link. The thinking is that if the link provides a description, however short, the person receiving the invitation may be more inclined to open the link.