Hi,
I agreed with Sir P. If we talk about CMS, CMS itself give you option to build stand alone applications. CMS does not include only Backend / Admin side of the application, but also front end / client side of the Application.
Mostly CMS uses their own Development Techniques, which is sometime hard to implement ( when you are working on specific section, like you need now ). If you ran trhough all the project from start then it was easier to do, rather then now.
so best solution for your query ( as i feel ) instead of looking some CMS , look for desired functionality Scripts. there are lot of site provide free scripts. ie phpfreak, hotscripts etc.
I hope that will help.
Cheers. 
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