it’s hard for me to commit to an editor that doesn’t look up method arg lists for me.
It is currently possible to look up a method’s arguments. The function is sclang-show-method-args, bound to C-c C-m by default. It isn’t perfect but it’s better than nothing at all.
It should be possible, maybe even straightforward, to integrate eldoc so the method args show up in the minibuffer whenever you’re inside an argument list. That might be the next thing I start to tackle.
I would love also if a keystroke (tab, probably) could expand the list of arguments into the code. This is maybe what you’re saying too. I’ll need to do some more research to find out the best way to accomplish that.