Notes without heads?

Short questions: Is it possible to enter notes and then remove the heads? I cannot find this option in the menu where I can change the node heads.
If it is not possible, is there an equivalent alternative?

I’m afraid not yet, felixp, but it is planned. For now, you can probably approximate the same effect by selecting the noteheads and setting them to be transparent using the ‘Color’ property in the Properties panel.