If you have the complete kernel build tree for your currently running kernel, configured correctly, and it has support for dynamically loaded modules, you shouldn't need to rebuild your kernel to build different modules / add new modules. BE CAREFUL THOUGH! I specifically used the word "shouldn't." Some modules have options which change header files, or object location definitions which can break kernel linkage. When in doubt, it's not too much hassle to rebuild the whole thing; the only impact is the time it takes to reboot.
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