The answer to 1) is "no". You need to copy, then delete. There is no "move".
The answer to 2) is "no". You need to attach the attachments manually after you created the item in the destination.
However, if the source item is a document in a library (i.e. it is a SPFile, not a simple SPListItem), then there is SPFile.MoveTo
try add this site to Trusted (or Intranet) Zone in Internet Explorer, it should resolve this:
In Internet Explorer, click Tools, click Internet Options, and then
click the Security tab.
In the Select a Web content zone to specify its current security
settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an ...
You will either have to get the last item id from the list and then create the url or create a custom new form or override the save action such that you save the item first and then redirect to the edit form.
After your comment I can see that the URL you might be creating is wrong. I tried to create the url and succeeded y doing this:
After getting the ...