Local Partitioned Indexes (adding Additional)?

I'm trying to find a way to ADD new partitions to local indexes and at the same time specify their tablespaces without having to DROP and RECREATE.

Here´s an example table based on yearly partitioning:

CREATE TABLE "TABL_ANOM"
(
ANOM_TS TIMESTAMP(6) NOT NULL
, ANOM_TIPO NUMBER(2, 0) NOT NULL
, ANOM_NIVEL NUMBER(2, 0) NOT NULL
, ANOM_ID NUMBER(10, 0) NOT NULL

[code]...

Here´s an index def for the table:

CREATE INDEX "TABL_ANOM_INDEX1" ON "TABL_ANOM" ("ANOM_NIVEL") LOCAL
(PARTITION DGSCOPSX_2011 TABLESPACE DGSCOPSX_2011
,PARTITION DGSCOPSX_2012 TABLESPACE DGSCOPSX_2012
)

OK. Now I want to add partitions for 2013 so for the table I use:

ALTER TABLE TABL_ANOM ADD
PARTITION DGSCOPS_2013 VALUES LESS THAN (TO_DATE('2014-01-01 00:00:00','YYYY-MM-DD HH24:MI:SS')) TABLESPACE DGSCOPS_2013;

and this works fine for the table but I can't find a similar command to simply add additional partitions to the indexes. I know that I can drop and recreate the indexes with the additional partition defs but on some of my tables, I'm dealing with hundreds of millions of rows and I think it would take way too long to drop and recreate all indexes on all partitions.

Also related is the PRIMARY KEY index partitions. Is there a way to add partitions (specifying the tablespaces) without having to DROP and re-ADD the CONSTRAINT with the additional partition for 2013?