I use ikiwiki for my blog, and I'd like the creation page of each page to be the one registered in the VCS. However, the only way to get that is really with the --gettime flag, which gets ALL the timestamps from the VCS... which take quite some time after a few years of writing 
So I'd like to suggest that ikiwiki could fetch ctime through rcs_getctime() by default when it finds a new page...
mtime is a different matter, not so important to me...
rcs_getctimeis for many VCSs still slow, requiring a new svn or whatever to be forked off (and in the case of svn, possibly make a network connection). In the case where a commit comes in that adds multiple pages, that would be a lot of work. And for the VCSs where it's not slow, it manages to not be slow by optimising for the case where all the times for all pages are looked up in one go .. which is still rather a lot to do when only a single new page has been added. So we lose either way, and it's not suitable for being run all the time, unfortunately.