Their ideavim plugin is pretty good. I didn't know at first, but it support an .ideavimrc file that allows you to set your own commands. Pretty much anything that you can do in a jetbrains product is connected to a command id that you can connect to a vim shortcut.

Include the most popular vim plugins as well. Easy motion and Nerdtree. Doesn't support language specific plugins, but core jetbrains products covers that