If you use Qualis Gems to bump your physical stats, and pump all your points into Int, you can very easily have 10 PS, IF, PD, Athletics, WM, and pretty much any other skills you might want to have.
The critical Int based skills to me are the following: Trainer, Surgery, First Aid.
Note that both Surgery and First Aid actually get significantly better at 10+4 compared to just 10, because they subtract from a percentage that starts at 100% instead of add to it.
For example, 10 First Aid gives you back 60% of your health. 10+4 gives you back 80% of your health, so that's 20% better right? Instead, it's more than 100% better.
Take the example of a companion of gets knocked out every round of battle (and no healing other than first aid). With 10 First Aid, they have HP that decreases like this: 100%, 60%, 36%, 21.6%, 13% (Wounded). With 10+4 First Aid, it goes like this: 100%, 80%, 64%, 51.2%, 41%, 32.7%, 26%, 21%, 16.7% (Wounded). Note that they participated in twice as many battles before becoming wounded. If you can keep yourself from getting knocked out, you'll be surprised at how many fights you can go through, and still come out with more than half your health.
The same reasoning applies to Surgery -- with 10+4, you lose about half as many soldiers as you would with 10, and lets your army fight much longer.