DV
You are obviously unaware of the types of missions the current MR2 is undertaking in both Iraq and Afghanistan. The only thing the current aircraft is missing is a weapons system although I am sure the aircraft could have been retro fitted for 500lb SDB if required.
As for the MRA4 it will not lack that as it is already setup with the required weapons databus to allow it (subject to clearances etc) to carry ANY of the RAFs current weapons systems. It will very easily be able to carry out attacks in the theatres you refer to, if we are still there... You obviously haven't heard of the term "Sensor to shooter", MRA4 will take out the need for the link to the shooter as it would be able to loiter for nearly twice as long as the current aircraft and have the ability to self designate and take out any targets detected. OK the EO needs to be upgraded to latest spec as it is still the old spec and is taking so long to come into service. Given upgraded sensors and weapons
I personally think it would be the platform of choice for any commander involved in either of the theatres you mention...PROVIDED IT GETS THE FUNDING AND SUPPORT!!!
Forget an expensive armed UAV which has its own limitations even compared to the current MR2 and just how 3 will ever be enough god only knows. The current need is for multi-role platforms that can deliver a long loiter ISTAR and attack capability.