Right now you indicate some PHP you want us to place on the pages where we want to use your plugin. This forces us to use unsafe plugins to enable PHP code.
You could very easily add some code to your plugin that builds that PHP code using the same variables in some wordpress code like
[TweetBlender var1= 'tweetblender-t1' var2-sources = '@knovitchenko,@tweetblender/testlist,#tweetblender,twitter', var3-refresh_rate = '60' etc]
Hope you take my request under consideration so I can add it to the list of plugins supported to my group of wordpress users.