A generating tool with a checklist would definitely be useful. I have been thinking about trying to put together a simple java or python desktop app for my own use that could build and submit a post with six fields:

• Web site name
• Article title
• URL for article
• URL for image
• Blockquote
• Additional original commentary (optional)

Eventually, such an app could be updated to make use of Open Graph in order to auto-populate some of those fields. It wouldn't be immediately useful for mobile use, though. You're right that this is most important there, but unfortunately, I know almost nothing about developing for mobile.

Something else that might be useful would be a "sharing service". In TheOldReader.com, they have a "Send To" option that lets you share links from your RSS feed in TheOldReader to other platforms, and it even has a way to configure sharing to your own preferred services (these and others).

How cool would it be to just do "Send To -> Steem", enter our own commentary and then let the sharing service worry about pulling the image, web site name, and excerpt from the "Open Graph" fields?