We have a large number of invoice approvers working from mobile devices and we use the 'send for review' process to assign invoices to the users 'inbox' to allow them to better track the large numbers of invoices they receive. This also allows consolidation of all invoice notifications into a single daily digest, which is not available with comments. It would be extremely helpful to have the ability to complete reviews on the mobile web app to keep our processes consistent regardless of device used.