the FOCUSSEQUENCE is not yet supported within the RISC client. (The attribute does not show up in the RISC environment.)
In general: the focus management is under our control, so there is no principal problem to include it. We currently do not have it on our plans for the next 1-2 months. To be honest: we believe no one was using it in the Swing client at all, besides some very special use cases. ;-) It is just so complex, to set up the sequence (not because of the way it is implemented... - I mean: to defining how to tab from there to there to there...)
Regards, Björn
PS: if you want to push us on this, please contact us directly