So, I have a spotlight above the garage that is a motion light. It's attached to a switch I'd like to change out to a Crestron one to gain control of, But, I'm not sure if there is a better way to do it. I want to be able to see it's state. Do you think the best option is to get a separate motion sensor and use an i/o?

The problem is that snow and car lights trigger it sometimes, and if its left off in the basement, we never turn it on. If we leave it on, some nights its on all night. So I want to be more energy efficient.

I have an external motion sensor connected up to my outside lights. Much more reliable than the all in one motion lights. Works fantastic. I have them come on at 30 minutes after Sunset to 20%. If anyone drives or walks up to the house they go to 100% for 4 minutes unless more movement detected. At 30 minutes before Sunrise they shut off. I've programmed in SIMPL so that they only come on after dark and the sensor itself is set for night as well.

I purchased this light. [Link: amazon.com] (very good light output FYI)
and replaced the Motion Sensor with [Link: goodmart.com]

That sensor has relay outputs so I can get the feedback from it. I had spare conductors at my garage door sensor's that I was able to tap onto. Now all I need to do is replace the switch with a Crestron dimmer, and have the motion bypassed. (all I need is the feedback), logic will dictate the behavior.