Thank you all for your comments! We will put your requests into consideration and hopefully we will get to the point where we can have all computers with many keyboard layouts to offer.
I am myself french and got used to the US layout (which is kind of universal between manufacturers). By selecting the Apple US layout in the OS, I am able to get french accents with easy to remember key combinations because they use the letters where we find those accents the most in french.
Accent aigu is [right alt + E] (then press the letter you wish to have it on)
Accent grave : right alt + `
Accent circonflexe : right alt + I
Tréma : right alt + U
Cédille : right alt + c (you don't have to press the C again on this one)
I hope it helps!