So I downloaded a configuration file from RafU_EkSDi (thanks btw),
some of the keys didn't work so I had to replace some of the keys in the config.
this config file applies for users only without a numpad like laptops or tenkeyless keyboards, Not 60% keyboards!

Installation:
-Drag and drop the downloaded 'trainerv.ini' file in your GTA 5 directory and replace it
Then you're done
(Make sure to have the original Simpletrainer mod from sjaak327 downloaded.)
https://www.gta5-hub.com/scripts/simple-trainer-for-gtav

Controls:
Open Menu - F3 (or F5)
Hide Menu - F5
Enter Menu - Enter
Go Back Menu - Backspace
Scroll Up Menu - ArrowUp
Scroll Down Menu - ArrowDown
Scroll Right Menu - ArrowRight
Scroll Left Menu - ArrowLeft
2nd Column Menu - Pause Break
1st Column Menu - ScrollLock

**MenuKeyCancel= is left blank, mainly because I use F5 or Backspace to just hide the menu**
**F5 key can also be used to open the menu as well as closing/hiding the menu instead of using the standalone F3 key mainly used for opening the menu**

Credits:
sjaak327 - https://www.gta5-hub.com/scripts/simple-trainer-for-gtav
RafU_EkSDi - https://www.gta5-hub.com/misc/simple-trainer-for-gta-v-better-controls