So the pages are being indexed. So what's the problem again?
He said that the problem is that google is
not ignoring sort and that he has duplicate pages being indexed.
@alex1: I think you have a lot of great ideas and just want to tell you to keep up with the suggestions and don't be discouraged from the sometimes rude manner in which your ideas are received. You just have to remember that this is a small development team and that the workload can probably seem overwhelming at times causing any request for additional work to be very, very carefully considered.
With that said, here is my 2 cents on your suggestions:
1) Have Google Checkout as a bundled Payment Option
Great idea and should be apart of future releases but should be rather low priority.
2) Fix the duplicate URL issue (I read the topics, but even with canonical statements, Google still picks up the non canonical and causes problems)
I'm with you 100% on this. The truth is that this is a problem and not just for SEO but for Social Media as well. Ideally there should be no duplicate URLs anywhere.
3) Fix the non SEO urls in Google Base
Simple fix. I'm using the Improved Google Base extension and apparently it already does this.
4) Allow Customers to be able to do a shipping quote estimate w/o having to go through the registration process
No brainer. Good suggestion.
5) Make it easier to setup OpenCart without having to manually delete all of the countries and zones that don't apply to you
Yeah a better interface for doing this would be nice. I just did it all directly to the database, made it a little quicker but I can understand the frustration for those less savvy.
6) Make default "does not subtract from stock" and more than "Quanity of 1" as default for those who drop ship
This is more of a personal touch and if implemented you'd have an equal, if not more, amount of people wanting it the other way.
7) Show the brands Logo on the brands page (what's the point of uploading the logo in the first place if it's never shown?)
I assume the logo was added with the intention of being used in the future. Can't wait to see the new manufacturers page.

The ability to change the title of the page (so it doesn't have to be the name of the category)
Not really in dire need but shouldn't be too hard to have product and category specific titles.
9) Easier way to do excel/csv/xml imports
The Export/Import extension handles this fairly nicely for stores with <10k products. Anything greater than that and it becomes a pain taking so long to download and upload the excel file. Not to mention your store will basically crawl to a halt while it bulk imports everything. An option to only import products that are new or have changed would be nice.
10) Ability to add or remove fields in the checkout process of what you ask the customer
Now we might be bordering on bloatware are this point. It's not too hard to customize these things and so I can't really say this feature is a must-have but maybe it could be added somewhere down the road when other more important things have been taken care of. Still, might be a bit excessive though.
11) Ability to have a specific field in the admin where you update the tracking number for the customer, and the customer receives it as a hyperlink so they can just click on the tracking number
Yes, an order tracking table might be useful for storing as many tracking numbers as necessary for an order.
12) Make "home" links SEO from the start
Should be an easy fix and I'm surprised it hasn't been done already.
13) Fix the search! The existing search system is not very good.
I couldn't agree more but this is something nearly every e-commerce site is lacking. Some prefer using AND, some like using OR. I think the search should be carefully thought about and a proper solution implemented sooner than later.
14) Better use of tags, maybe a page that lists all of the tags used (helps with SEO), similiar to manufacture page
Not too bad of an idea. Perhaps you could dump them out at the bottom of the sitemap.
15) the user being returned back to the site after making a payment with PayPal (or Google Checkout)
This already happens.
16) sales tax report - so you can easily calculate how much sales tax you collected
An improved reporting system with a handful is pre-installed reports would be nice but this feature shouldn't be too high priority at the moment.
17) Ability to turn system cache on or off (it causes more problems when it's on, on a small install)
Good suggestion. Perhaps take this a step further and implement debug levels like CakePHP. If debug is set to 1, show errors and turn cache off. If debug is set to 2, show errors, SQL queries and turn cache off. Otherwise, you're in production mode.
18) Google Sitemap module should only list the canonical URLs
Agreed.