Manually adding mappings to iprewriter element?

[Fruglemonkey]

I've looked over the documentation and it appears that there currently isn't a handler/method to manually write mappings to an iprewriter element. Is this the case, or have I missed something?

I'm interested because I'm currently trying to instantiate click instances with some rewriter mappings pre-installed, but this is proving more difficult than I initially thought. Can anyone point me in the right direction? Thanks.