Great handbook. I'm big fan of the factotum, ever since discovering it I've had a soft spot Int focused builds for non-traditional classes.

Here's some more PF feats & traits a factotum (or an Int character) might find useful.
Feat:
Artful Dodge
Requires: Int 13
Benefit: +1 dodge AC when your the only one threatening an opponent. Unsure if the applies to multiple opponents if flanked/surrounded, probably don't want to test it .
Special: Acts as the Dodge for prerequisites. Can use Int rather than Dex for feat prerequisites.
src

Traits:
Clever Wordplay Use Int for one Cha based skill
Bruising Intellect Use Int for Intimidate
Student of Philosophy Use Int for Diplomacy to persuade and Bluff to lie
Precise Treatment Use Int instead of Wis for Heal

Also, while the fluff is very different, the PF class Investigator is mechanicaly pretty similar to the Factotum in terms of using Int and a resource pool (also 2/3rds casting) to make themselves awesome at pretty much everything.