That's a double edged sword IMO as it can lead to them standing at the base of each tree and pointing at branches "whilst you're up there with the chainsaw, see that one to the right there". When you explain its not included in the price they may want to offer to trade pieces of work whilst the job is underway, you can then pause operations for as long as it takes them to point at all the branches they now want cut and point out those that they no longer want cut because they have changed their minds.
Some folks can keep this up all friggin day
If a client wants to start directing the work then its gonna be hourly rate and we can talk as long as they want
In saying that its definitely wise to summon a client over upon completion whilst the climbing system is still in place, 2-3 extra cuts is easier to handle than an unpaid bill. I think its also handy to point out that these are extras not in the bid rather than just doing as requested without question, these types of customers need to be managed to minimise the extra time they consume. just my 2 cents