Starting to play around with the nifty new feature of converting a subflow to a custom node. Seems to work well so far. Instructions are very straightforward thanks for that!
One question I have - is there currently a way to change the palette category like there is with custom nodes? The default seems to be "function" but I'd like to change it to something else to keep all my test stuff together.
You can set the category of the subflow via its edit dialog - on the appearance tab. That should get honoured as you go through the steps to package it as a custom node.