Hey everybody, this feature request we all want may or may not ever see the light of day. But if you are about to switch to 1password or something else because of lack of HIBP integration with lastpass, there is a possible alternative for you to be able to keep using lastpass.
This guy made a python script that you can at least check all your lastpass passwords on demand: https://github.com/kojenov/lastpwn
For those of you worried about security, it's only 41 lines long, if you have any coding experience you should, like me, be able to work out that:
A. it doesn't use the internet at all
B. it works by comparing a CSV of your passwords (which you export from lastpast) against the entire 10+ GB database of passwords from HIBP (here: https://haveibeenpwned.com/Passwords
C. Looks safe to use.
I'm still waiting on the torrent download of the password file. But it looks like this will do the trick, at least for a one-off check of all your lastpass passwords against all the passwords in the HIBP database.