Global concurrency || Optional filterable job names

[dotMortis]

SRY :D I just noticed that the job name does not have to be the same as the queue name.

Hey!
Since I use different Workers for each process because it's not possible to filter jobs by custom fields, it would be very good if we could set a global concurrency flag.

I really don't want to set up multiple servers or oversize a single one for a worst-case concurrency scenario.

Perhaps an optional job name that can be filtered would also be a good option, if that would be more feasible. :D