Yes but i think that will be better to just move to 3.7.3 (today), 3.7.2 has a few things that i needed to fix
you can use / try it in the live mode, but is not customized (and so, maybe the installer doesn't shows up in the menus) - you should use e16 for install first
and later, run "api enlightenment" to install e22 in your installed system
yes 
sudo -E eliveinstaller-wrapper
yeah but e22 will require TOO many work, this is just one thing between 
instead, elive will start to make its own E (last, newer than e22) with own EFL packages too, when will work on that
