Eclipse Scala interpreter (REPL) - proper use and debugging

Question

I would like to know what are best practises of using Eclipse Scala interpreter (Eclipse Scala IDE).

Let's say I have application with breakpoint in it. Is it possible to debug an application in such a way, that I can execute/evaluate expressions inside REPL at the specific breakpoint? If yes how can I achieve it?

Another thing that made me wonder is what's the difference between opening the interpreter as Run configuration or opening it trough Window -> Show view -> Scala interpreter.

Do you know any other uses cases of Eclipse Scala interpreter that are interesting to know about, like for example Ctrl+Shift+X to run selected expression?

Answer 1

Maybe it is an obvious advice, but in addition to merely starting REPL in Scala IDE you can run selected expression in it: just select the expression and press Ctrl+Shift+X (default hotkey).

Update
There is a comprehensive reference for Scala interpreter (thanks Mirco Dotta).
It is also worth to mention that in near future Scala interpreter is going to be enhanced significantly: integration with Scala debugger and implementation of a concept known as worksheet are on the way.