Scala Language Console (Nika builds)
New scala console comes with build 0.5.89 (http://confluence.jetbrains.net/display/SCA/Scala+Plugin+Nightly+Builds+for+Nika).
Now you can use full featured editor for editing code in console (just instead of Enter, use Shift + Enter).
And after execution:
This comes only with Nika scala plugin builds (this is the first difference between Nika and IDEA X plugins).