Increasing bit rates to maximize available disc space.

I am loading up HD footage to burn to a dual layer SD DVD.
I have an 82 minute feature film that I burned and used about 5 gigs of space on the dual layer DVD.
Here's the issue: If I have an 8 gig dual layer disk and only use 5 gigs, I am leaving 3 gigs idle which I would like to use to get the most quality possible. The problem is that I get capped at bit rates of about 7.1 mbps average and 10 mbps maximum (this limits me to only using 5 gigs). If I can increase the bit rate, I can use the idle disk space and, more importantly, get better picture quality. The problem is that I don't know how to get beyond the mbps cap limits. Is there a way?
I hate to leave the gig space idle. It feels like I am walking away and leaving money on the table.
Thanks
Jim

David, the cost of the DVD is not what is driving this (DVDs are very cheap), rather the desire to get the best picture quality as possible for my movie is driving this. By using the remaining 3 gigs of space, I can put more information on the DVD, compress less, and get better picture quality.
You ask "have you tried to play this 10mb file of yours? Can't be done on 99% of DVD players." I did burn it and play it on my DVD player and it worked just fine. I just want to see if I can't get a better picture quality by using the idle 3 gigs.
As far as a blu ray system - yes I do want one. Finding one that is compatible with a mac system, burns reliably, and produces blu rays that will actually work on most blu ray players probably won't happen for a couple of years at least. Not to mention the fact that blank blu ray disks costs about $20 each, so I will be adding $20 to each festival entry fee for my movie by using blu ray and that assumes they all burn perfectly with no waste involved.
If I can't increase the mbps rate, then I suppose I am stuck with what I have. I just want to know if it can be done better.
Jim

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