Yes...The object enabler for Autodesk's Architectural Desktop is incorporated into the RealDWG delivery, and you do not have to install it. Other object enablers can be downloaded from their respective vendors and installed.
When you are downloading object enablers from Autodesk or other sources, download the Autodesk® RealDWGTM 32-bit version. When you are prompted for a host application, select Bentley V8i (SELECTseries) - Autodesk® RealDWGTM.
Not currently...Only 32 bit enablers can be installed and used with MicroStation V8i, regardless of Operating System. Some 32 bit enablers may be configured to NOT allow installation in a 64 bit environment. This is normally by choice, by the vendor. If an installer of the 32 bit version of an object enabler does not have an option of installing it in an 64 bit environment, check with the vendor to see for other possible options.
By removing the variable from the Workspace > Configuration list, the program will revert to the highest version supported for that RealDWG version (in the Configuration window, click the Delete button and then Save and restart MicroStation).
Bentley V8i (SELECTseries 3) - Autodesk® RealDWG(TM) 2014 Readme
How to download latest Autodesk REALDWG