Can I set masked devices to be R1 or R2 capable?

You can:

On both the local and remote Symmetrix, select the devices which are to become dynamic RDF and create script text file with syntax below:

set dev attribute=dyn_rdf;

Here is a sample text:

###########################################

# Set Sym devices to DYN_RDF on DMX-3 1234#

# 31/03/2009 By David (see design Doc) #

###########################################

set dev 06A3 attribute=dyn_rdf;

set dev 06A4 attribute=dyn_rdf;

set dev 06A5 attribute=dyn_rdf;

set dev 06A6 attribute=dyn_rdf;

set dev 0904 attribute=dyn_rdf;

set dev 0905 attribute=dyn_rdf;

Make sure to set this attribute on remote devices also.
After created script text run symconfigure to preview and commit the change:

symconfigure -sid 1234 -f filename preview -v

symconfigure -sid 1234 -f filename prepare -v

symconfigure -sid 1234 -f filename commit -v

After the symconfigure complete successfully, you can validate if those devices attribute are set accordingly by running symdev list -dynamic command. 
You can use symdev show , see sample output below.

C:\>symdev show 03C3

Symmetrix ID: 000190101235

Device Physical Name : Not Visible

Device Symmetrix Name : 03C3

Device Serial ID : N/A

Symmetrix ID : 000190101235

……………….., ……………………, ……………

Device Configuration : RDF1+R-5 (Meta Head,

Non-Exclusive Access)

Device is WORM Enabled : No

Device is WORM Protected : No

SCSI-3 Persistent Reserve: Disabled

Dynamic Spare Invoked : No

Dynamic RDF Capability : RDF1_OR_RDF2_Capable

Hi Roop

Thank you. I manage to convert the standard device to be R1_R2 capable

Regards

Itekeng Mosea