I think you may be looking in the wrong place if you mean "WebFOCUS Repository" (and not an external "SQL Repository" managed from the DMC or WebConsole).
That kind of information is stored in the Synonyms (Master and Access files) on the WebFOCUS Reporting server, or I'm guessing in your case the DataMigrator server. In Release 7.7.07 and 8.2 we've added some procedures to simply extracting this information, but you can still obtain it in 8.1.
Most of the attributes you mention are in two (virtual) system tables (syscolum and systable) and you can extract that information in a DataMigrator flow (or a FOCUS TABLE request). These tables are distributed in the home/catalog directory which you can expose from the Application Directories context menu choice filter.
Alternatively to create a data flow with one of those tables as a source you can right click on the left side of a new workflow and instead of selecting a table enter one of the following.
Now you can use these virtual tables as you would a real table although you can't join them.
From systable to get the actual database table name
From syscolum you could select
TBNAME, NAME, ALIAS, READONLY
Note that FIELDTYPE=I is almost only used for indexes on FOCUS files not RDBMS tables. You can get the key information however.
Finally the attribute "SCD Type" is only used by DataMigrator and only in flows with a Load type of Slowly Changing Dimensions. As it happens that while that attribute is stored in the Access File it's not exposed in the syscolum table. If that's something you do need please open a case with InfoResponse requesting it as a new feature.