No that's not right.
The UCA may have a different bend to clear the coil bucket. But that won't give more down travel.
You are still limited by the strut lenght.
to get more down travel you will also have to get strut spacers or extra long struts.
So UCAs on their own will do nothing for travel.
Cheers
well that isnt the experience that "Sossel" and "ONLOCK" have stated, the measurements that they got seem to contradict what you are saying, unless there and my math are bad.
http://www.navara.asia/showthread.php?t=12429
There is another thread where Onlock installed them and gave some more measurements, just cant find it at the moment.