You cannot enter a value higher than one in any color module.
WORKAROUND - You can graph it and select the point you want to change and then set value to any number, but it will be clamped back to 1 if you adjust in Details Panel.
1. Open Launcher or GitHub Version of 4.6.0 (Preview or Live)
2. Create a New Particle System
3. In Cascade, go to the Color Over Live Module and adjust the Color over Life value to a Distribution of Constant and any number greater than one on the RG or B Channels.
RESULTS: Clamped to no greater than 1
EXPECTED: Any value should remain in the Color Channel settings.
Head over to the existingAnswerHub thread and let us know what's up.