I don't think that this is immediately possible without heavy re-architecture of Sitecore's rendering pipelines. That being said, having time, a decompiler, and hacker-ninja skills, anything is possible.
The rendering of a placeholder is done differently and separately than the rendering of a rendering itself. Taking a quick look at the pipelines available in the Sitecore configuration, it becomes pretty obvious that architecturally changing placeholders in this manner would be pretty involved.
Additionally, as a rule of thumb, I generally advise people NOT to muck with System Templates too much (yes I know you can) due to unexpected results. Unless you are able to satisfactorily regression test Sitecore itself, and feel confident in your changes, I generally avoid that area.
But your question begs another question: Why?
Are you trying to default rendering parameters? In which case, you can utilize the
Default Parameters field to set default values of the rendering.
Another thought I could see is if you have a multitude of components and you want to "lock" in the parameters, it might be possible to hook into the rendering pipeline, and substitute the default parameters for the rendering before it is added.