Best answer by RetiredTripleHelix
I've found the answer to this: these shortcuts are required. They're part of the WSA branded Lastpass to ensure it can load into each user account on startup, otherwise you may not be able to use it in each browser for each user.
This looks to be a fairly recent change as I have them on my system as well, but the intent is to make the user switching process more reliable so that it always works in each browser.
Hope that helps! http://www.wilderssecurity.com/images/smilies/smile.gif