Not currently, but that's a good idea. I'll add that as an option in a future release. I'm sure I can get that into the next release. If I have time, I'll also update the Auto Arrange feature so if you've selected horizontal layout it will auto-arrange nodes horizontally.
The customer download site has a patch (20180406) that adds a horizontal option for node positions. On the node canvas, it's Menu > Settings > Add New Nodes To Right. If you've selected this option, the Auto Arrange feature will also auto-arrange horizontally instead of vertically.