It's totally alright to my ears. But I think it sounds nicer if you say:我们边走路边聊天，还一边拍照. which seems less redundant with 边 three times,and 一just one time, hehe!

Yes you can. but I prefer to say like this: 我们边走边聊边拍照片

you can use 一边 as many times as you like, as long as you have the ability to do all these things at the same time and combining them together can make sense after all.

hi, you can surely use that way. however it may sound a little redundant, just as what Joseph above said, and a comma added is much better.

hello maybe you can use in this way:我一边吃饭，一边看玩电脑，一边和我的朋友讲话。