The latest version of the F5 Management Pack (v1.6.1212) supports SCOM 2007 RMS clustering.
You can download the F5 Management Pack here:
http://devcentral.f5.com/Default.aspx?tabid=217
Here’s the article describing the configuration of the F5 Management Pack in a SCOM 2007 RMS cluster:
http://devcentral.f5.com/weblogs/jbalog/archive/2010/01/18/clustering-the-f5-management-pack-with-scom-2007-rms-cluster.aspx
The integration and support for SCOM 2007 RMS clustering will improve with our future releases of the F5 Management Pack.
Any feedback is greatly appreciated, as we strive to make the F5 Management Pack a better product.
Thank you for being part of our community.
Julian Balog
F5 Management Pack Team