Sef translate need for Automatic Joomla site translate. So when t=you go to any URL What Sef Translate support - site will translate automatic.
But there are two option:
- translate with help Ajax
- and translate with help Redirect
But for translate with help redirect with out lost site - you need use sef translate Pro version.
Not full understand what you means, and how I can see that. But all ours Joomla components Open Source - so you can hide all what wish.