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Yes and no;

The root domain usually tends to get far more links then your inner pages, as any links about your website / brand usually come in here. Should you target keywords on the root; it would benefit from having the increased in-links.

The result would then depend on the level of on-page optimization that you are able to do on the home-page or internal page. Usually on internal pages you can control far more the content and thus make better on-page optimizations, should the levels of optimization be more or less the same I would safely assume that your home page (root) would take prominence.

The CMS should be up to the designer to use - obviously you as a client should make sure that there is a good product delivery and that the back-end meets your expectations.

I would agree with your Developer that WordPress is very limiting. Whilst good for Blogs and News-oriented websites it was not built to cater for other websites. CMS like TextPattern or Symphony allow much better control on the structure and output, allowing for better dissection re-use of code and potentially better SEO. I've been using Symphony for over 2 years and I've found it brilliant - I can control and make small SEO tasks much simpler, as I structure the data the way I would like it, rather the standard way the CMS thinks is correct.

Note that SEO has nothing to do with the CMS itself, its more about the implementation as done by your developer. Whilst WordPress has some plugins to make this easier it is not necessarily the only and best way.

It would depend on what you refer when you say to go for a new HTML5 pattern.

If you want to replace some div elements with section you can go ahead it should not make as much impact. As long as your HTML is valid and makes sense it should be good. Make sure that when you upgrade to HTML5 you still support the current browsers. IE8 and lower require some rules in order to render HTML5 properly.

I would suggest if you are doing this switch to also use things like Microdata - which on the otherhand can really improve visibility on search engines.

Hi Kirstian, I think it would depend on the context. Is your website or service relevant to this wiki? Who does this wiki cater for; are they people who might be interested. What will the wiki-page be about just your company or else is it just a link in a normal article.

I think all of these play a part. If there is a relative high traffic to be expected from this page / site it could work out as branding or marketing exercise. Then you are not just measuring SEO value gained, but also possible leads. I believe a link would still be somewhat valuable however I would be more inclined to take it up if it is relative to the particular context.