Is there a way to plug in to extension points?

[vjpr]

See http://www.jetbrains.org/intellij/sdk/docs/basics/plugin_structure/plugin_extensions_and_extension_points.html

[dkandalov]

Adding extension to extension point, yes.
See wiki or Console.groovy source code.

I never tried adding new extension point from liveplugin. Something like this method might work ExtensionsAreaImpl#registerExtensionPoint. Or may be using ExtensionsArea interface (the API is xml oriented though).

Overall IJ APIs were not designed for reloadability, so if you do something interesting, please send a code snippet :)