I am also interested in this feature, but here is lifehack I use to share clipboard and workaround poor desktop experience of vesa(4): I run X server on my host machine, and redirect output to it using DISPLAY env var. So, all apps are running on OpenBSD/VBox but with full screen and shared clipboard because they use my host X11 server. I also use smbclient to share files.
- [OT] VirtualBox guest additions support for OpenBSD Darren S.
- Re: [OT] VirtualBox guest additions support for OpenBSD IL Ka