is it time that the Loyalist politicians got the same treatment as the Republicans and are suspended/expelled from government ?
Yes. (Assuming the politicians can be linked to the terrorism. After all we never excluded the SDLP)

Or are some groups more deserving of special treatment despite the fact that they refuse to declare a ceasefire , refuse to decommision their weapons and state that they will never give up the armed struggle and pursue their objectives through purely peaceful political efforts .
No. But some groups are deserving of a big slap in the chops and being told to grow up with all this bloody marching.

Ah. British terrorists are confusing. Here in the US, we just lump them all together in the "Islamic Fascist Freedom-Haters" category
This would be especially ironic for the IRA, who are catholic marxists.