I would consider the timing "No Impact" to be the closest match to a "Standard Change" in the ITIL sense. A Standard Change, according to ITIL, is a change that is "preapproved" because its impact is well understood or very limited. There is an excellent white paper on working with Change Management Approvals that I have referenced here.
I think the section you will want to look at is building Change Management Approval Processes. There is a section on "by passing" approval processes. In this case, you could build an approval process that will by pass all but one or two approval processes.
Per the Product Manager…
Standard - A type of change that must be coordinated by a change coordinator and for which a change template exists that has been approved by the service owner. Standard changes are considered changes to the infrastructure that follow an established path, is relatively common, and is the accepted solution to a specific requirement or set of requirements.
ITIL and BMC's Standard change Definition:
ITIL:An ITIL standard change quite simply refers to pre-approved changes.
ITIL Pre-approved changes can be defined for a variety of tasks,but they will typically be low risk, low effort changes that have a low o rknown cost.
BMC:Standard indicates a change (for example, a computer upgrade) that is
typically pre-approved and requires only approval by the change manager.
Standard changes follow the out-of-box change process defined as per ITIL
ITIL and BMC's Normal change Definition:
ITIL:An ITIL normal change refers to changes that must follow the complete change management process.
By definition a normal change will proceed through all stepsof the change management process and will eventually be reviewed by the ChangeAdvisory Board (CAB).
BMC:Normal indicates a standard change (for example, the creation of a virtual
machine with standard specifications) that is typically pre-approved and
requires only approval by the change manager. Normal changes do not
follow the standard out of the box change process. The default value is Normal.
The only difference not qualifying ITIL's Standard change with BMC's Normal change is that
Normal changes do not follow the standard out of the box change process while Standard does.
But BMC do consider them on equal basis as you said.
May be your customer is relating to that?
Hope so this clarifies you somewhat!