I looked up some stuff online, but it seems like there's good stuff out there, and then people have to go and mess it up by adding something unbiblical! So I'll try and answer this the best that I can, interjecting some opinion here and there, so keep that in mind.
Prophesying: There is prophesying all thru the bible. Even in the new testament. The question is whether it can still occur today. I would say that the reasons for prophesying are for 1) to complete the scriptures and 2) give creedence to what the apostles were teaching. I would say that today it is unlikely that people could forsee the future or prophesy, simply because the scriptures were completed when John finished the book of revelation. Can God use people to prophesy? Absolutely. God can do anything He wants, but based on scriptures (and I could dig some up if you want), you would have to stretch far to find reasoning behind prophesy now. So, in that, I think that considering the completeness of the scriptures, prophesy is no longer necessary. God has told us all we need to know, for now.
Healing, miraculous signs, tongues, etc: You won't hear of the "gifts of the spirit" exhibited in a RM church. Does that mean that someone couldn't speak in tongues? No. Again, God is in charge and can do what He wants. I however believe that speaking in tongues is exactly what the bible says. The bible tells us that the tongues in question were different languages. If someone were to speak in tongues today, they would need an interpretor to interpret what they were saying. So, yes people can speak in tongues, just not "blabbidy bloppity blah blop". I don't think that is scriptural. Healing; can people be miraculously healed? God can heal. There are also other examples of gifts of the spirit, examples would be teaching, preaching, serving, giving, leading, and showing mercy. So in those, yes, we see those all the time. They are just not the outwardly noticable gifts. When you say gifts, obviously, most people think immediately of tongues, healing, etc. But there are other gifts, and yes I believe they are very important, and integral to God's church.
That's about the best I can do without looking up a ton of scriptures and taking up this entire forum with a post. You might go to this website:
http://www.thecra.org/restherald.htm
They have a lot of useful stuff, from biblical scholars who are far more experienced and well versed than I am. It's a publication written by ministers, professors, and ton's of people from the RM. Hope this helps SOME!