You can adjust max TC value in
my documents/SH5/data/cfg/Main.cfg.
Code:
[TIME COMPRESSION]
; The first value is the default one, the second value is used when 'travel mode' is activated.
; The two values should be separated by a comma.
; If only one value is specified, that value is used for both default and travel mode.
TimeStop=0
RealTime=1
LandProximity=1,256
CriticalDamage=1,256
CrewEfficiency=128
AirEnemyDetected=1
SoundEffects=2
CharacterAnim=32
FriendDetected=1
EnemyDetected=1
RadioReport=256
Particles=32
PrayState=1
HunterState=1
3DRender=512
Maximum=512
However, this could decrease game stability because SH5 doesn't like TC higher than 512...