Hi Vince,
Based on a rough description of the feature on a blog (http://blog.super-networking.net/2006/07/cisco-csm-info/), I think the equivalent functionality on LTM is a OneConnect profile. If you're using SNAT you can use the default OneConnect profile with a 0.0.0.0 source mask. If you're not doing source address translation on connections to the pool, then it's best to create a custom OneConnect profile with a 255.255.255.255 source mask. This ensures the source IP the pool members sees matches with the client side TCP connection.
For details on OneConnect, see these pages:
SOL7208: Overview of the OneConnect profile
https://support.f5.com/kb/en-us/solutions/public/7000/200/sol7208.html
OneConnect wiki page
http://devcentral.f5.com/wiki/default.aspx/AdvDesignConfig/oneconnect
OneConnect? For my iRule? - Deb's article
http://devcentral.f5.com/Default.aspx?tabid=63&articleType=ArticleView&articleId=114
Aaron