Include data quality in SDS's data_type character?

[WayneCrawford]

Currently, if we include "clock corrected" and "not clock corrected" data (data quality flags "Q" and "D", respectively) in a SeisComp Data Structure (SDS), they both fall into the same file, which works with fdsnws-dataselect but is not very clear.

Could we take advantage of SDS's 'data type' character to eliminate this problem, by adding 'data type's 'Q' and 'M'? This is legal within the SDS definition and can be used by at least some SDS clients, for example using the sds_type parameter in obspy's client.

But it could only work if these changes are officially declared (so that other uses of this letter are not allowed) and integrated into fdsnws-dataselect. Note that the data_type 'R' is already used for response data.

Any thoughts?
Wayne