JCL DD statement, new DISP parameter status options or modifiers

There should be a way to specify in a DD statement the three following uses cases. Note that the "name" of each use case is simply to allow easy reference to that use case. Whether or not its actually implemented with that name is up to the implementer.

REPLACE
Indicates one of the following:
• A new data set is to be created.
• If the data set exists it will first be deleted.

TRUNCATE
Indicates one of the following:
• The data set exists and is to be truncated/emptied.
• A new data set is to be created.

CREATE
Indicates one of the following:
• The data set exists.
• A new data set is to be created.

I image that the above could be implemented in one of two ways, but obviously there may be others:
- As new "status" options within the DISP parameter of the DD JCL statement.
- As options within a new parameter that can be used if a DISP status of NEW is specified.

This should also be implemented in other systems that offer similar functionality, such as TSO ALLOCATE and other dynamic file allocation processes (DYNALLOC, BPXWDYN, etc.)

It is perhaps of interest to note that these options are already available for MVS UNIX files using various options of the PATHOPTS parameter. This RFE makes those same (basic) options available for traditional (legacy) MVS data sets.