[aur-general] eb- & arp- tables packages / other question

Hello I've added ebtables recently, but arptables is already added by someone else. Problem is - that PKGBUILD is a little careless (using /usr/local, trying to install into real filesystem). I left a comment and contacted current maintainer by mail, but no reply so far. What is the best way to adopt such package ? As for the the other question - I've some builds for already existing packages, but in a bit specialized way - i.e. by default installing into chroot environment. Is it ok to add such packages to AUR (i.e. mldonkey-chroot) with proper conflicts / provides tables ?