Hello,
Only LSA Type 5 routes can be tagged. So if you want to add a tag of 1000 to all static routes while redistributing it in OSPF, then it is possible.
You can refer this link for adding tags.
http://forums.juniper.net/t5/ScreenOS-Firewalls-NOT-SRX/OSPF-external-LSA-in-ScreenOS/td-p/13759
Regards,
Rushi