I just released the Kudos version 0.6 and it supports custom plug-ins!!! Yaaahooo!
Download version 0.6:
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http://www.evanbot.com/kudos/bin/kudos-v0-6.zip
Patch for version 0.5 users:
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http://www.evanbot.com/kudos/bin/patch-v0-6.zip
I'll make a short "hello world" plug-in tutorial soon and show you all how easy it is to make a plug-in. And to install plug-ins is really easy, just upload the folder and it works!