As a Facilitator, you may add agenda items and make proposal, as any other Core Circle Member.
Now, being a Facilitator, you may hand over your Facilitator Role at any time in the process if you feel unable or unwilling to enact the Role’s duties according to Section 2.5.4 . It could be at the beginning of the IDM process or later during the process, for instance when/if the Facilitator raise an Objection.
And I think this should answer your two questions. If not let me know.