In EndlessSpace_Data in the endless space directorythere is a file called sharedassets17.assetsuse notepad++ or equivilent program to open it up using Find search for the following below
By modifying cost you can change the amount of trait points available.
However as the game employs a character count you have to be careful. This means that 65 can only be two digits meaning you can only achieve 0 to 99 trait points to get around this problem you can reduce one of the other races trait points to a single digit to get 999 trait points. It should be fairly obvious which races are which from the descriptions of affinity name.