Before you do a feature request please check and make sure that it isn't possible through some other means. The JavaScript enabled console is a powerful feature in the right hands. Please check our Wiki page for more info and help.
If you'd like to contribute to go-ethereum please fork, fix, commit and send a pull request. Commits which do not comply with the coding standards are ignored (use gofmt!).
See Developers' Guide for more details on configuring your environment, testing, and dependency management.