I think could be a nice feature start using the concept of template or group for jobs. When we want to create a Job based on other Job we have the option "Copy existing Job". However, let us imagine a scenario where we have a lot of jobs that has a lot of stuffs in common. After a while, we want to add some new configuration for all these jobs, for example use the "Discard old buids" configuration. Now a days, we have to edit each job to add this configuration. Adding the concept of group, we can add this configuration to the group, and all jobs attached to the group will get the configuration (RHQ from JBoss has this concept with alerts).

If exists workaround to do that now a days, please, let me know.