Hey, that makes good sense, because that way instead of the charger only running 100% of the time, you have a timer running 100% of the time, plus the charge running part of the time,....

Not always, but most times it is safer to use stuff as it was designed to be used.
Your charger is a 2 stage charger. Once charged, it will drop down to float voltage (13.4 max) and stay there, during which time it will use very little if any water.
Running any multistage charger for short periods of time on a timer, could cause it to spend most.....if not all of its time at higher voltages, possibly causing more water usage, especially in warm weather.
If for some unknown reason I thought I had to run a timer, I'd prefer to run it on a single stage float charger such as the 1 amp from Harbor Freight.

If you're not socked in on snow or ice, ride it! No timers except what you can stand and great for winter blues. I'm good for 40 miles at 40 degrees. I know that's pitiful, but it's still riding. I have a float charger still new in the box, but I never got around to hooking it up. And I don't ride if there is a chance of ice.

I've tried my float charger ,for a while with and without the timer . Without the timer ,the charger is  constantly on and warm which is normal, but bothers me a little . With the timer ,the charger blinks green for 15 minutes when it first goes on ,then turns green . I'm running it for an hour a day . It seems ,it can't really do much harm to run it this way ,and also safer.