seems like it's possible to do right now with a proper filtering options (in Files window), multiselection (Ctrl+A) and delete button

Thanks for the reply! It's a dealbreaker if I want to use SmartGit both for git and svn repos in the current workflow on a project I'm working on. I hope sometimes in the future this '/' inconvenience will be eliminated and I'll be able to enjoy working with svn repos through SmartGit :)