Having the CR-90 swing towards a Raider isn't a bad move. If your front is crippled, then you can block all incoming fire from the Raider by swinging towards it. It then means you can fire whatever you have in the rear section at the smaller ships around you. How many CR-90's have much in the rear, anyways?
A CR90 has one hardpoint in the rear. In a very limited fire arc. Better rear-wards than that of the Raider, less of a deadzone, but not exactly as much a threat without the fore section guns.
I'm going to venture in as a bit of mediator here... Kick me out if I'm not wanted!
While the tactic you describe here works for about two turns, three if you're lucky, Blue Five is playing a longer game with positioning. He's saying you might be able to ram the Raider once, but then you're going to be stuck behind the Raider facing the wrong way... with very limited fire due to the damage you've already suffered to your guns being crippled.
Anyway - it's your home rules ... But I think the more you play with the big ships, the less the rams will happen, the less you're going to need that house rule... I've seen them less and less as time has gone on, except for when we pull a new player into the fun and they learn the hard way despite many warnings!