Ability to add bond holdings (or manually edit market value)
You can't add bond holdings to your portfolio currently in the same way you can do with stocks. The only way to track bond holdings is to use a made-up ticker like explained here: https://help.yahoo.com/kb/finance/SLN4888.html?impressions=true.
Ideally bonds would be available in the database just as stocks. Otherwise it would be very useful (actually for any kind of holdings not supported directly) to be able to manually edit a holding's market value (even if just for such made-up tickers). Because without that you can only track the current or purchase price of a holding, but not price changes.