Hi, I am a NICU nurse, and a regular lurker. Congratulations on the newest family members
From what you have posted it sounds like the babies are being very "typical" for 32 weekers. I understand your frustration at the parents visitation amounts. Unfortunately, it is not all that uncommon. I joke at work that if I had a babe in the NICU, security would have to make me leave. I do understand, however, that recovering from a birth (I assume C-section) and caring for an older child might make it more difficult to visit more frequently.
You have received some great input already, so I'll try to be brief. Typically babes do not start nippling from a breast or bottle successfully until they reach about 34-36 weeks gestation. Kangaroo care is great, and babes can be encouraged to suckle if they are interested, but it won't be for nutritive purposes. It's great that their momma is pumping to get them the good stuff
She may need encouragement to pump often enough and long enough to build up and maintain her supply. I often see discouraged mommas that start losing their supply early, and it seems to be caused by not enough pumping. You may be able to provide her with some research on pumping to help her avoid problems.
As far as co-bedding the babes, they can ask what the hospital policy is on that. I'm sure it varies from hospital to hospital. My unit is very focused on developmental support. We co-bed our multiples as soon as they both reach 4 pounds and are able to keep their temperatures regulated outside an isolette. There is generally not enough room in an isolette for 2 babies and the myriad of equipment and wires they both will have. Also, if a babe has an episode of apnea that requires intervention to get the babe breathing again, it would be difficult to do effectively with another babe in the way.
One suggestion I can add to the list is to have the mom bring in a small blanket or luvie that she has worn against herself so that the babes have something with her scent on it in their beds. Another thing that they can do, that I encourage parents to do, is to bring in a disposable camera that they can leave at the bedside. We sometimes catch especially cute moments in the middle of the night, and we can share them with the parents through photos.
Ok, I said I'd be brief, and I've obviously lied
If you have any specific questions or concerns I'd be happy to address them with you. Again, congratulations on the new babies!