DX(G) Is there better pdf reader software for the D00801?

I would be interested in jailbreaking my kindle D00801, if I could install a pdf reader that gives me control over the margins.

Here is what it looks like now:



I got this device as a dedicated pdf reader. The screen is A5 sized, so the text is a bit small, but if I could crop out the margin, it would be perfect. Sadly, you can't do that on the stock software.

I'd like someone with experience in custom kindle software to recommend some software I can install, that would let me manually crop into the margins when I load a pdf; if such a thing exists.

Here is a mock up:



Thanks.