custom comments

Hi all,

On my products page i have a block that shows up above the comments/commentform. Now i'm looking for a way to move the comments and form above that block but since they are 'hard coded' it seems impossible without hacking ... i tried using minipanels but it seems they are not possible to add as content ... is that correct or am i missing something?

In general, user will type the subject (optional) & comment to submit the user's comment.

Is it possible to provide additional comment fields to the user to fill-in during comment submission ?? If yes, need suggestions on how to configure Drupal to accept additional comment fields and display the same ??
Ex: Rate the following along with the comments :
(a) Features (1 to 5)
(b) Reliability (1 to 5)
(c) Ease of User (1 to 5)
(d) Documentation (1 to 5)

Refer drupalmodules.com website in which drupal modules are reviewed or commented based on various categories.