Avian 1, there is no policy available to require Block Download on all sharing links. There are some conditional access policies that are similar though, which allow you to block download on un-managed devices for example.
Maurits Knoppert, this is something we are looking at as well but Block Download for specific people will be coming a bit later. Stay tuned!
jab365cloud, as announced at Ignite, we aqre working on expiration on a per site basis now (i.e. a user's access to everything on the site will expire at the same time). We are looking at per-link expiration as well. Definitely go submit/vote for this at onedrive.uservoice.com though!
PeterWhitehouse, that should be there now. Are you not seeing it on your device?
Stephen Kerkmann, the Block Download feature is still rolling out and so may not be available in your organization yet. Stay tuned!
Stephen Rice
OneDrive Program Manager II