SEAD on this plane can be done.
Add these two lines to Su-30.lua, under pylon 7, in DCS World\Scripts\Database\planes
{ CLSID = "{B1EF6B0E-3D91-4047-A7A5-A99E7D8B4A8B}" },
{ CLSID = "{0519A264-0AB6-11d6-9193-00A0249B6F00}" },
This will add Mercury and Elint pod. With Elint pod you can search for and lock on the enemy radars.
Enjoy.