Any chance that might be put back in?
If you take a look at the XML files in .../assets/Gameplay/XML you can generally find workarounds for some of the missing trainer options. For example, using Russia I was able to work around the Max XP option by doing the following:
1) Find 'BUILDING_KREPOST' in CIV5Buildings.xml in assets/Gameplay/XML/Buildings
2) Look for the block:
3) Change the 'Experience' number to however much experience you want to be added to the unit, and repeat for 'DOMAIN_SEA' and 'DOMAIN_AIR'
Because the Krepost is a special building limited only to Russians I can be sure that other civilizations won't get the same benefit (so long as you don't play against another Russia) and the Krepost can be built after researching only 2 technologies. This is just an example, but the XML files make it easy to modify the game to your liking (I also UNfixed the Helicopter Gunships being able to capture cities...)
firewall and other security software.
on trainer and game.
version and distribution.