Is there a way to enter multi-line statements, or is it possible to implement it? Is it possible to implement a history search? E.g. shell-like Ctrl+R or maybe even like https://github.com/dvorka/hstr

Try shift+enter, command+enter, e.t.c. one of those might work, I can't remember

yep, that should the job, depending on the OS (win vs. mac)

And to your second question. It is always possible to implement a feature like history search. Am I going to implement it? No immediate plans. btw. with up-arrow you should be able to cycle between previous commands

ok, I just tested the shift+enter on my mac, it works in standard js prompt but it does not work in dirac's, this is a regression

will have to look into it