I remember once upon a time, playing in games where you said what you intended to do, and the rules simply were there to help determine how well that worked.
But... for rules to 'forbid' you from performing actions that are rather obviously possible? That is a very modern gamer issue.
You can of course attack with the wrong end of the spear at adjacent opponents. Is it a good idea? probably not. Can you? The answer must be a yes.
To say no to that question means tossing out any sense of choice or realism. That is to say that either you are not actually in control of your own character, or that reality somehow forbids you from doing things that should clearly be possible... like shaking a stick at a dude.
Which is exactly why this will NEVER, EVER, EVER nor SHOULD it EVER, EVER, EVER, be answered in a FAQ.
Because it is yet another in a long, sad line of questions that are not covered in the rules because they are common sense.
Is heat damage and fire damage the same? That question has been asked here by many fools, and still many more fools have hit the FAQ button. I've seen the answer from the designers, and it is that they will never FAQ that because you ought to know it without being told. Inane questions like these abound. "If I'm not flying, am I walking? I don't believe I am because the rules on flying don't say that when I don't fly I walk!" I warned the designers of 3.0 way back when it was announced and bits were leaking out, that they were rewarding the worst of the players out there - people who cannot allow their characters to take a breath without a rule governing it - by codifying every little action, and that has been proven true again and again over the years.
In short (too late), don't expect to get a FAQ for this, because it is common sense that the answer is yes. It does not need to be in the rules. Any reasonable GM will say, "yeah, I've seen a hundred movies where a guy gets hit in the face with the pommel or haft of a weapon, rather than with the business end (Darth Maul vs. Qui-Gon Jinn, anybody?!?!?), no problem."
The designers expect you to reason this out, just as thousands, if not millions of players have done before you. There is nothing new about this question. It comes up all the time. GMs allow it all the time.