Cached Forms Don't Submit

I have setup the index and edit actions to be cached in my
PostsController as follows:

var $cacheAction = array(
'index' => array('callbacks' => true, 'duration' => '7 days'),
'edit' => array('callbacks' => true, 'duration' => '7 days'),
);

Everything is cached as expected, but the edit form doesn't submit.
This is expected as well, if you think about it, but is there anyway
to bypass caching when a user submits a form?

I set callbacks to true to allow AuthComponent to do its magic, so if
I could put some code in beforeFilter(), it's executed dynamically
(not cached). I have tried each of the following in beforeFilter(),
one by one, but none of them did the trick:

if(!empty($this->data)) clearCache();
if(!empty($this->data)) Configure::write('Cache.check', false);
if(!empty($this->data)) $this->cacheAction = false;

To avoid the "why would you even want to do that" argument I see in
other forums, I'll explain a little further. My edit action is fairly
intensive since it's such a long form with a lot of "stuff" in it and
caching definitely improves the performance. To avoid writing extra
code, the edit action displays the form as well as saves it.

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