It would be nice to be able to override a single template without keeping a 
private copy of the entire template directory. 

a setup option like

   templatedirs => [ "my/dir", "/usr/share/ikiwiki/templates" ] 

ought to do the trick.

> Now that I look at the source, I see that ikiwiki already falls back to the 
> global dir when it cannot find a template. For me, this is good enough.
> And it is even documented in the man page. Sigh. I guess this could be 
> considered [[done]].  

I have a use case for this, a site composed of blogs and wikis, templates divided in three categories : common, blog and wiki. The only solution I found is maintaining hard links, being able to have multiple template dirs would obviously be better. -- Changaco