Additional Form Fields in 1Password 8

Now that I understand about the custom fields, the stumbling block for me is more that there are lots of sites where I can't seem to get 1Password 8 to create an entry from the browser and I have to resort to just clicking the "New Item" button and filling in everything (i.e. the URL as well as UN/PW)

I have a feeling that there's probably something in my workflow that is habit from 1P7 that doesn't work with 1P8.

Adding new entries is just infrequent enough and also usually when I'm in the middle of a high priority task that I haven't spent the time to try and work out what I might be doing wrong.

What types of fields did you manually add/edit after a signup previously?

The two for me were:
* as mentioned above, a secondary username distinguisher - often called company or similar
* setting the "remember me" checkbox for low security sites

I also seem to remember that with 1P7 some of those multi-page login sites (e.g. username first, submit, then password, submit) I had to manually fix up the entry afterwards.