Looks like it’s only the Xara.com issue still outstanding in this topic.
Unfortunately it’s in the category of not being feasible to support saving the entry after sign-in occurs (see my recent investigation notes for more explanation if you want).
Thankfully it can work just fine if you already have an entry saved in KeePass/Kee Vault. The main trick is to make sure you use the URL of the actual website that is asking for the sign-in credentials - in this case that’s https://www.magix.com/ap/servicecenter/index.php?lang=US&style=magix&module=quickregister . This is where the iframe stuff that @dkebler noticed comes into play (it would be insecure to fill a password for xara.com into an iframe for an entirely different website).
For bonus points you can add a Radio form field to the entry with name: fm_logintype, id: fm_logintype_1 and value: 1
That ensures the correct radio button gets selected so that you don’t have to click it manually to avoid the registration process being started when you or Kee submits the form.
I’ve only tested this on Kee 3.1, which isn’t quite ready for release yet so there’s a chance there is something else that will stop you in v3.0 or lower.