When I add a new account e.g. a general account, manually, it would be nice if I could generate a password in the process. As far as I see this is currently not possible.
I'll pass your vote for this along to the developers! Thank you for your feedback.
For now, you can create a separate "Generated Password" item (which will also act as a safety net if you ever delete your Account item) by selecting File > New Item > Password from the menu bar.