sorry for the late reply.
yes, you can do it and you can find even some simple chat made with hfs scripting on the forum.
you will need version 2.3 anyway.
you can have
<form method='post' action="~process-form">
<textarea name='comment'>
and then in the template you create a new section
[process-form]
{.save|myfile|{.postvar|comment.}.}
my example is very bare, but it's a good start.
search the forum for examples.
here you can find a list of all available commands