I've been discussing this with my group, and some of my PCs have had some ideas/requests to editing a tree that they like.
For example: our Smuggler would like to replace the 25 xp Grit talent at the bottom of the Scoundrel's tree with Improved Side Step (which seems fair, considering how it seems like the kind of talent a Scoundrel might have, and Improved Side Step is a 25xp talent in its source tree.) Our Skip Tracer wanted to replace Bad Cop with Good Cop.
I've made 'Wandering Sellsword' a melee-focused mirror of Bodyguard that replaces his Barrage talents with Second Wind, and his Brace Talents with Rapid Reaction.
I think some of them seem kinda fun, so I'd like to share them, if the community wants.
What do you all think? Is this the kind of thing you might allow in your games, within reason?