Hello new guy playing S07, i knew S06 before but didn't play it.

Here's the things:
1. I try to modify the names of jockey and ADD other on the list, HOWEVER it didn't work. Added jockey DOESN'T shown when played. black screen wallpaper
2. I try to change game pool and percentage , however most horses where kept by only 1-3 foreign trainers or owners, others only have 1 or even zero. Is there a way to modify and divided it equally?
3. And bonus question, first thing first i'm a money cheater, i was wondering how to MODIFY BETTING? I mean, pari-mutuel means that what you can win is from the betting pool total, so getting 100 million pound/dollar from a handicap i think ISN'T TOO REAL? is there a way to lessen this? By the way i won 100 Million from a 7 Accumulator Bet of 5000 ish bet.