You can still do that. Just install the Rust (or any other language) plugin to IntelliJ. You can essentially build your own "jack of all trades" IDE if you want to.
I didn't know they had added this. I just took a look and seems it was added in 2022.3. That's still relatively recent, fwiw. I'm still on 2022.2 for Intellij (because of how they bundle their kotlin plugin), but this will solve my problem with Rider and Goland for the next few months,
They had something similar called Settings Repository for 8+ years before they switched to Settings Sync. You could also just sync the settings directory yourself using git, rsync, Dropbox, etc.
I have an all products license so it's not a blocker but I wish they would just make ultimate, truly ultimate.