Handle split packages

[musteresel]

fradeve on Arch forums noticed, that split packages (in his case vim) aren't handled the way it should be.
https://bbs.archlinux.org/viewtopic.php?pid=1242788#p1242788

[musteresel]

yaourt is using $pkgbase for itsself, but not to determine whether to call customizepkg or not:

custom_pkg "$pl_pkgname" && customizepkg --modify

where custom_pkg checks for the presence of a file /etc/customizepkg.d/$1.
$pl_pkgname ist the "name" result from pkgquery (http://git.archlinux.fr/package-query.git/tree/doc/package-query.8#n228)

When one would try to build (via abs) vim-runtime from extra, yaourt would call package-query like this:
package-query -1Sif "%r %n %v %a" vim-runtime
The resulting string is (at the moment on my system):
extra vim-runtime 7.3.918-1 x86_64
The second word (space seperated) is then vim-runtime which is taken for $pl_pkgname

So when building vim-runtime from extra yaourt should look for a file /etc/customizepkg.d/vim-runtime

But because it's a split package there is only one PKGBUILD for vim, vim-runtime and gvim.

So to customize THIS pkgbuild one would (check whether this makes sense) need a file for every single package of the split package.

=> Is it better to have customistation for each PKGBUILD or each (binary) package?