Yes the default fuse backend doesn’t supprort options under linux.
However if you compile from source with go build -tags cmount then rclone will gain another command called rclone cmount which behaves identically to mount, except it does use the fuse library directly. That is how mount is implemented on Windows.
rclone cmount will accept the fuse options!
You can also pick up a pre-built binary here: https://1069-17803236-gh.circle-artifacts.com/0/tmp/rclone.dist/rclone-linux-amd64 - circleci builds these on every commit.