1. You can add metakeys and header links through Page properties section or use a custom control with HtmlClass
2. There is an option for "additional url" that you can use in case of some redirects or rewriting( applies for Sitefinity 3.x editions.)
3. There is a url rewrite module( this applies for Sitefinity 3.x editions)
There is no problem to use JQuery. You can use the JsFileLink control to add a jQuery script automatically on a page.
In Sitefinity 4.0 you can use ResourceLinks control
There is no special build for 64 bit machines. You can use 32 bit mode compatibility of the application pool under 64 bit machine.
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