I would just wait for Atlassian to come up with a solution for Confluence 5.x, since they already annouced, that they are going to merge those two themes in the near future. But if you are in for challenge, create our own custom theme based on the default theme and grap the sources for the documentation theme and extract the sidebar stuff from it.
The main problem is, that the doc-theme has several positioned panes. If the content is larger than the pane you just scroll within this pane due to auto overflow. This will not work for the default-theme as you have only one pane and it is not positioned anymore. The container height therefore will be as height as the content and this leads to problems because one time the content is larger than the pagetree and vice-versa. This can be fixed by using a table element as a container, although this is semantically incorrect. Still you will face the problem, that you can expand the pagetree after the page is loaded and sometimes the container will not expand and the pagetree gets cut off. I have not been able to complete fix this yet and I will also wait to see what Atlassian comes up with.
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