Your question is a bit unclear. Do you mean "Has Paizo published any documents that cover a) designing your own items (besides the Craft rules); b) creating your own feats; or c) creating your own racial traits?
Write it up and run it past your GM.
If you are the GM, go for it. There is a very helpful homebrew forum who will give you feedback if you want to sanity check your idea.
There is:
designing spells
The notoriously imbalanced race designer
there is also a point buy weapon design system in weapon masters handb-book.
Nothing for general item, feats or traits that I could find. Trawling through those should give you an idea of design principles - maybe. Common sense tells you not to make something so good it knocks anything else out of the water. Don't make something that makes stacking ability scores on to one skill/ability too easy. The type bonuses are there for a reason. etc.
Have fun.
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Write it up and run it past your GM.
If you are the GM, go for it. There is a very helpful homebrew forum who will give you feedback if you want to sanity check your idea.There is:
designing spellsThe notoriously imbalanced race designer
there is also a point buy weapon design system in weapon masters handb-book.
Nothing for general item, feats or traits that I could find. Trawling through those should give you an idea of design principles - maybe. Common sense tells you not to make something so good it knocks anything else out of the water. Don't make something that makes stacking ability scores on to one skill/ability too easy. The type bonuses are there for a reason. etc.
Have fun.
Thanks for the feedback. All great ideas. I will look into them.