They're plenty possible to do, but they aren't easy. Some of the mini games are easier on controllers, others are easier on keyboard.
Using the component item cheat to sell the extra components worked for me to make cash fast.
ok not sure why, I am loading directly from uplay, not steam, and all the options are working. The money option as mentioned before is touchy you have to do it just right in the coon store then shut it off. Besides that its all working here.
Pressing TAB has worked for me to get out of the 'empty' inventory screen when you have Mega Money enabled.