Dear clogwog, thank you, that's the sort of thing I'd like. And so do over half a million Unity Remote users.
Gianluca - deploying to a target device every time you make a tiny little change (particularly if trying out different styles, or tweaking a font size, etc), is a ridiculous waste of time. Far easier to make changes on the main platform you like to edit on, and then see what it looks like on a tablet. It also allows you to try out other aspects, like sensors, which don't exist on a PC or Macbook, again without deploying.
"So, my suggestion and try the debug mode of Qt Creator. And tell us if there is a real valuable difference on what Unity does with remote control."
The real valuable difference is that Unity can do it, and Qt can't.