jQuery: extend method - how to save/keep/do not break the initial reference?

Here is an example.

http://jsfiddle.net/R9V4p/

Is it possible to make s.c==60 at the end and do not overlap provided values with default ones? For example i have prov开发者_Go百科ided testing function with s.clean=true instead of false.

Ofc i can write my own function for this. But maybe it would be nice to post a suggestion topic for this feature on jQuery forum, to be able to select which object to return in extend method options?