It would be really nice to have a textfield where I could evaluate some PHP code inside the current context. I would e.g. execute print_r( $foo ) and it would display the result inside a output view.

This is huge for me as well. I was just looking through the DBGp docs and there are a couple of things that make me think it's possible (though I am not sure if the xdebug backend for PHP supports them).

http://xdebug.org/docs-dbgp.php#id63
http://xdebug.org/docs-dbgp.php#id74

This feature has been added to version 1.5.

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Thank you for your bug report. This issue has been closed and fixed in git. This change will be available in a future release, but you can download the change at any time from the git repository, found at http://www.bluestatic.org/git/.