Assemblies are locked when used with LINQPad, probably because LLBLGenPro plugin locks them.
It would be nice to have them shadow loaded if possible.
You mean the linqpad driver locks them? Perhaps in the future. It's open source though, you could send a pull request
I don't think that Linqpad does it (possible though) - it has assembly shadowing implemented but I didn't investigate much.
But you are right, I might tinker with sources.
Also which assemblies are locked? The runtime libs? Or the generated code ones?