Shift click to select multiple clips in Import menu.
Right now it seems like you have to select every clip individually when using the import window. Normally I would shift click on the top and bottom clips to select them all. Having to import dozens or even hundreds of clips individually (if you want to exclude a group in a folder) is quite painful. It also seems like it's not possible to remove more than one clip at a time from the selection panel at the bottom.
Yes, this is certainly in the plan. Thanks for the feedback. You can follow the discussion on import happening over on the beta forum https://community.adobe.com/t5/premiere-pro-beta/discuss-new-import-workflow/td-p/12130677