The question was if someone who needs help can/should go to him to get advice, a brocha, or an outright miracle.
Whether or not he has ‘supernatural’ abilities does not entirely answer the question. It depends on where it comes from, and how it is used.
I ask my Rebbe advise all the time. I am not aware that he has any such mystical abilities. But he knows a lot of Torah, and gives me clear well-thought out practical and intelligent answers. And its free.
It also depends on what type of person you are. I know someone that went to Rabbi Kimmel and was very impressed by his advice. To me it sounded ridiculous and useless, but to him it was like a bas kol. He was told to change all of his Mezuzos because they have ‘brown spots’ on the parchment. Sure enough, they did! I asked a sofer, and he told me that 90% or mezuzahs have them and they are 100% kosher. But even after hearing this, my friend was STILL pleased with the advice he got. He said to me (seriously) “You see! – Rabbi Kimmel knew that I had the spots, and he EVEN knew that I am the type of person that would want to be makpid to get mezuzohs without them!!” And yes, he actually changed his mezuzohs.
If you are a person that PREFERS supernatural and mystical advice and methodology, maybe you can go there to get some. I am not passing judgement, but to me that would seem nonsensical and meaningless. He would probably know that about me as soon as I walked through his door, and either throw me out, or maybe give me practical advice instead. If I could afford it, that is.
Note – Generic statement, not specifically about Rabbi Kimmel: Rabbi Yisroel Reisman has warned people not to go to any ‘mekubal’ that tells you to bring along your wife’s kesubah or other such important documents etc… Some of them like to find invisible problems with them and say that you can’t have good children or whatever because of that. Rabbi Reisman claims that it is wrong to passul or to create a re’asah or doubt about such things. For example a pesul on a kesubah which applies lemafreiah, for a couple that have been married for many years!