While we are having a good old constructive dialog about wingeing about sessions, how about the nurdlers and the pootlers?

In our area, we sometimes get a few fiddlers who want to play a tune set but haven't yet decided on what they are going to play so they start up a bit of a rhythm by scraping two strings at a time - not a tune, more of a chair in the parking space to stop anyone else getting in. These are the nurdlers.

At the other end of the set, while they are trying to think of another tune to add on the end, they go for a but of experimental unstructured pootling where they play bits of parts of sections of tunes more or less at random for a few minutes until they come up with something they like.

Meanwhile, everyone else is, well, you get the idea.

Any other vocabulary that fits the sessions experience?