Modifying default blocks?

I'm writing a module for a client; so far it creates a new content type (a test, which consists of a bunch of questions) and then stores the product ids that will allow access to the test (which seems like a problem in the future, as currently).

I'm now working on the customer-facing views (the customer comes to the site, buys a subscription, and is able to take certain tests), and I'm trying to figure out the best place to make these test visible-- I'd like to display a list on the member / index view.

Is the "right" way to do this just modifying the default/views/blocks/member-main-resources?

Is it possible to do this in my template instead?

Will it cause problems in the future to modify a file in the default module?

Sorry to post so soon, but in reading the contoller I found this:

Code:

$this->view->assign('left_member_links',
            $this->getDi()->
            hook->call(Am_Event::GET_LEFT_MEMBER_LINKS, array('user' => $this->user))
            ->getReturn());

I assume that I should be looking at the Am_Even Stuff for this kind of thing?

Sorry to ask such basic questions... I see now that you can just add an event handler in the bootstrap.php

public function onGetLeftMemberLinks(Am_Event $event) {
$event->addReturn('JAH!!!', 'testing_links');
}