A question (sugestion) please

[Ovidiu Angelescu]

HelloMy name is Angelescu Ovidiu and I used to develop an old live iso called RoFreeSBIE.I am trying to help now GhostBSD project.I like very much actual pkgng (pkg ) tool.The question is:Does actual pkg has triggers as debian apt ?Triggers are very usefull especially when upgrading/updating packages.In debian if package_1 install a trigger it is added in packages database and if package_2 writes files under certains directories defined by trigger installed by package_1 then it's launched trigered script installed by package_1.
As an example package_1  is a configuration package for package_2 but it's slight different than package_2 default config file. let's say I want astabasta.jpg as background for kdm instead of kdm default.jpg.When kdm is updated/upgraded in config file kdm default.jpg is restored.If there are triggers a trigger search if I have astabasta.jpg instead of default.jpg and if not it changes to astabasta.
If actual pkg doesn't have triggers please implement this.It is very usefull especially for rolling distro's and can be used when upgrading/updating packages.
Thank you