Use MacVim as standard Terminal?

I used to love the terminal.app for many reasons. I especially liked the way I could navigate to a file and edit using vim it all in one app, without having to leave the keyboard. But, since the terminal.app doesn't support many of vim's rich features, I decided to make the step to MacVim. This breaks the symmetry though, I have to use terminal.app to navigate to a file, edit in MacVim (using mvim of course), quit MacVim and open up the terminal again. Isn't there a way to use MacVim in stead of terminal to do all this? I'm not talking about iTerm 2 etc, these apps don't cut is for me. I'm talking about true unix command line in MacVim.. This should be possible, I guess, only... is it?