variable timing for intermittent wipers, 124

[tld]

I am wondering if anyone has changed their single intermittent wiper timing to variable timing? Thinking along the lines of patching into the intermittent circuit ahead of the set timing sequence and utiliziing the front/rear speaker fadder on the console to operate a variable time windshield wiper control. Is this feasable or even worth the effort? I would really like to have more control over the monowiper. Any and all comments will be greatly appreciated.