You can feed green beans and snap peas on a daily basis but they shouldn't make up the majority of the diet. Here's how I feed my crew...
Three quarters of their daily meal is a greens mixture: 50% Collard greens and 50% other mixed greens such as Mustard, Dandelion, Turnip, and Chicory (Endive)
One quarter is raw shredded veggies: butternut and acorn squash, parsnip, sweet potato, a little carrot, green beans, and whatever veggie I might have in the fridge (peppers, zuchinni, summer squash, radish, etc.)
Twice a week I use a product from Cricketfood.com called salad topper. It has about 30 or so nutrients in it, all from natural sources, including probiotics. I also have RepCal pellets available for them to munch on but I doubt that these represent more than 5% of the diet.
I use fruits and wheat bread as treats. They also get some cooked pasta or rice occasionally.