Since you didn't create the layout, you can't edit it, but you can get the raw source code here:

http://www.livejournal.com/customize/advanced/layersource.bml?id=8013072

and then make a top-level layout layer of your own with that code, and then poke around the code to your heart's content.

For using post titles as links, I think this is the bit of code that outputs that part of the entry:

<td class="dateheader"$screenedfg>$*text_subject</td>

So you could try replacing that td line with

<td class="dateheader"$screenedfg><a href="$.permalink_url">$*text_subject</a></td>

I can't promise that will work, but it's worth trying.