Yes absolutely. I do it often

The only catch is you need to require the namespaces first in the REPL to evaluate them in the expression window

Right, you can use the evaluate expression window, but not the main REPL window. I’d like to fix that, so that the REPL can be used as a fancier evaluate, but that’s not there yet.

There are complications, such as whether the REPL should take into account the currently selected stack frame or whether it should evaluate always in the top frame. That affects completion etc.

Ah I didn't know about the expression window, this is great thank you