Welcome codycbradio. You can already change controls by editing the contents of the file keyconfig.plist, found under the folder oolite.app/Resources/Config. For using numpad keys for controlling the ship, you can change the initial entries of keyconfig to the following:
key_roll_left = 314; // numpad 4
key_roll_right = 316; // numpad 6
key_pitch_forward = 318; // numpad 8
key_pitch_back = 312; // numpad 2
[... rest of file]
Oolite understands the numpad keys as having keyconfig codes from 310 (numpad 0) all the way to 319 (numpad 9). Oh, and if you are on Windows, avoid editing using Notepad; we've had problems with it. Wordpad or any other text editor should be fine though.