well i have a question for you, your not being too clear, are you talking about just having a form on your page for customer comments or are you talking about an active blog type display that when customers make comments they are posted on your comments page automatically.. huge difference
for the simple contact form just use
http://phpformgen.sourceforge.net/, you can get it thru your fantistico link on your lp control panel, but i can tell you that the db version of that is messed up, just do the strait form style when you install and then you can modify the form and process yourself to suit your needs...
take a look at the bottom of this page
http://www.durangodaves.com/id6.html is that what you want..