Cruise control can be installed but you need some expert guy and buy cruise control kit online. Before that make sure that the current ECU has provision for cruise and meter has light.
Immobiliser cannot be installed. I asked Indus and they said that a whole new set of ECU and other equipment was installed in all Corollas except Xli and it cannot be hooked into existing ECU.
If you want both these features. Do sell your 1.6 and move to 1.8 CVti Curisetronic. I was very happy with 1.6, but wanted immobilser badly so sole it and added some money to upgrade to Grande.
I understand that there are budget constraints in such an upgrade, but if you could manage, you can have these goodies and also upgrade, car, model, features etc.