FEATURE: Shipping Method ETA’s With Shipping Lead Time Display

FEATURE (2012.5): Shipping Method Lead Time display
Provide more clarity for your customers by specifying ETA’s based on shipping method, along with other
useful features…

On Store Shipping Settings:
If enabled with the checkbox, this will show Lead Time on shipping methods when offered to a customer. The Lead Time text will become part of the ShippingMethod's Name on the order and be displayed in shipping method merge codes and in the admin console. Your lead time should include the time it takes for you to ship the package, along with the ETA of the shipping method chosen. Lead Time excludes weekends and defined holidays.
NOTE: This does NOT take into account back-ordered items or any ETA set on the Product or Product Status.
# Days: This can be either a single digit or a two digit range separated by a dash, such as "4-6". If a range is specified, the date range will be displayed on the method.
Cutoff Time: If a time is specified, the order must be placed by that time or the lead days adds an extra day. Time must be based on Central US Time Zone (GMT-5). Format: "2:00 PM" or "14:00" for 2PM central time.
Shipping Holidays can be defined as a comma separated list of dates.
Those dates are excluded from Lead Time.

Store Text settings available for ShippingMethod_LeadTimeLabel
(ex: "Receive By:") and ShippingMethod_LeadTimeDateFormat (ex: "MM/dd/yyyy").

As seen on the shipping calculator:

The Lead Time display becomes part of the ShippingMethodName merge
and displays in existing merge code locations.
On OrderEdit we retain the same delivery timeline on the shipping
method so it doesn't arbitrarily change when editing the order.