Again is not a matter of adding or removing a spinner it's the technology to handle the render gamma, max already has that, there is no need to have it inside the render engine, you can manage that from max, just change the max gamma and you have what you need with the gamma you want, create a maxscript to handle this and you are good to go with ANY render engine, not just Corona.
Cheers!
It's all about ease of use. Can you change the Max gamma in real-time during render? You ask why? Because.
Keymaster, if the gamma spinner induces some error or problem - please tell about it, what error or problem? We didn't encounter any during our tests.
If the problem really exists - we will cease all our questions.
Thanks for understanding.
p.s. Settings won't become much more overloaded because of this parameter :)