Meta descriptions don't affect your rankings in search engines - they just help entice people to click on your results in the search engines - have a look here for further peace of mind - http://www.seomoz.org/learn-seo/meta-description

So you can change them at anytime and it won't affect your rankings.

I would start by signing up to Bing webmaster central in there under Crawl Control you can set what rate and time of day your site is crawled, bearing in mind that if it is left on standard it will take a long time to crawl and index your site - if you have a large e-commerce site this will definitely cause an issue - I would look at turning this up "full volume" as it shouldn't have any negative effects. Though keep an eye on the impact this has on the load of your server - most reasonable setups will handle this fine. Another very good indicator of any issues your site might have with being indexed by Bing, in the Bing Webmaster Central, is the fetch as Bingbot tool which will allow you to drop a URL in from your site and it will show you what comes back from Bings point of view. If there was something that was hindering it such as a robots.txt it would inform you.

Join Bing Webmaster Central now and see what information it provides you with your site if you haven't already done this.

Also be aware of the Queries per second limit allowed on your server as this has been known to hinder/stop Bing indexing a site when they haven't been able to access the content sufficiently when preforming a crawl especially on larger sites which are constantly being refreshed and updated.

Doing this will lead to keyword cannibalization, so I would recommend you have a read of this post from Rand in regards to the issue for a greater understanding

- http://www.seomoz.org/blog/how-to-solve-keyword-cannibalization

If I were you I would aim to make each of the title tags different...

I agree with Dirk - the names you have suggested would work fine and there is a clear difference between each. Obviously the more descriptive you can be with each file the better - but often easier said than done on eCommerce sites.

Google does look at h tags to understand the structure of the content on the page better, Googler John Mueller confirmed this several years ago. Therefore it’s good practice to have your H1 as a main page or title of the piece then main subheadings as H2, any further sub-headings needed to divide content under these H3-H6. A lot don’t go to this depth and focus on H1 and multiple H2s achieving good results. When I have taken it further I don’t believe it has made a significant impact on rankings compared to when I haven’t. 
Hope this helps

Hi

Are you using an international domain such as .com or are you using a country specific domain as this is one obvious way Google can determine your location other than in Search Console. If you are using an international domain Google looks at several factors to determine your location including IP Address, any address listings on your site, Google My Business and even links to your site.

Have a look here - https://support.google.com/webmasters/answer/62399?hl=en

Hope this helps!

Matt

I personally would ask for a name and email address, as this is common practice online and it will allow you to know what each person is specifically interested in as you say. I don't think that is too much information and the data gathered would be valuable. In my experience this won't put people off and if it does are they really that interested in your product in the first place - I think you a separating the wheat from the chaff that way!

In terms of QR codes and their use in Asia you may find this article about China's use of them useful - http://techcrunch.com/2013/05/29/people-actually-use-qr-codes-in-china/