[Libguestfs] parallelization

So Richard recently blogged about running many libguestfs mounts in parallel. I actually want parallelization in the other way; I use guestmount to access a disk image, and my program is multithreaded. It does read/write and most especially calls to link() and fdatasync() from threads. However, this all ends up being serialized, because the guestfsd protocol is synchronous, and the daemon side is single-threaded. Related to this, the qemu instance is always booted with only one vCPU. Have there been any thoughts on fixing this?