The file is in the freelancer /data folder the file name is constants.ini
heres the entry you need to add to adjust curise speed this is for cruising only
replace the X with a number of your choice this is an example of the first two entrys not the whole file. Be careful
[Constants
COLLISION_DAMAGE_FACTOR = 0.500000
MUSIC_CROSS_FADE_DELAY = 10.000000
MUZZLE_CONE_ANGLE = 40
PLAYER_COLLISION_GROUP_HIT_PTS_SCALE = 3
PLAYER_ATTACHED_EQUIP_HIT_PTS_SCALE = 5
MAX_PLAYER_AMMO = XXXX;add this line to adjust ammo
[EngineEquipConsts
CRUISE_DISRUPT_TIME = 5
MAX_DELTA_FX_THROTTLE = 0.250000
THROTTLE_STEADY_TIME = 0.500000
THROTTLE_ATTEN_MOD_RANGE = 8.000000
DELTA_THROTTLE_ATTEN_MOD_CHANGING = 8.000000
DELTA_THROTTLE_ATTEN_MOD_STEADY = -1.000000
CRUISE_STEADY_TIME = 2.000000
DELTA_CRUISE_ATTEN_MOD_STEADY = -1.000000
CRUISE_ATTEN_MOD_RANGE = 8.000000
CRUISING_SPEED = XXXX;add this line to adjust your cruising speed