Yeah, management of all this data is really horrible right now. This is an ugly workaround but you can manually edit this stuff via the preference plist.
If you have developer tools installed (specifically Property List Editor) or Plist Edit Pro, you can open the OmniWeb preference file and locate your autofill data and manage it this way, look for the key called 'OWFormAutoFillSets", your autofill data will be stored inside.
Plist Edit Pro lets you actually do multiple selection.
If you just want to nuke all your autofill data, you can do this via the defaults tool in terminal.
Code:
defaults delete com.omnigroup.OmniWeb5 OWFormAutoFillSets
Your preference file is of course located at:
~/Library/Preferences/com.omnigroup.OmniWeb5.plist
If you're interested in Plist Edit Pro it can be found here:
http://www.fatcatsoftware.com/plisteditpro/
If you really want to edit the preference file in a text editor you can convert the preference file above to xml like this:
Code:
plutil -convert xml1 ~/Library/Preferences/com.omnigroup.OmniWeb5.plist
Then open it in the editor of your choice. OmniWeb will understand the file in this format but it may degrade performance a little. You can switch back to binary by replacing xml1 in the above command with binary1.