Each scenario I've played has given the mechs "0" pilots. They have both been training scenarios but I didn't know if that was the norm or if there was a way to change them?
Training scenarios 1 and 2 have pilots with "0" piloting, so they won't fall down so easily. Those are training scenarios for beginning players, after all.
If you wish to change those values, just change the extension of those scenario files to .txt or .rtf and edit those values manually (you will just change numbers, that's all). Then save the file and change the extension back as it was before.
Training scenarios 3 and 4 have better or worse pilots (3/5 and 4/4), exactly as they were stated in the original BattleTech Introductory rulebook.