We are trying to keep our Silverlight and WPF versions in sync, so the following goes for both.
Unfortunately, bookmarks and Word content controls have not been scheduled yet and there is no timeline for when they are going to be supported. However, if all goes according to plan in Q1 2011 we will be introducing features like mail-merge and read-only sections that may be suitable for your case.
If you'd like, you can elaborate a little on your scenario and the means you would find useful for its fulfillmentq so we can have a better overview of the requirements.
Looking forward to your reply.

Thank you for the follow-up.
The features you are looking for won't be available in the official Q1 Release and it is unlikely that a workaround could be found.
We will, however, have them in mind for future improvements of the control and additional features.