How can simple tools be used in 32-bit-per-channel images?

I have just begin working with HDR imaging. I am using it for what it was designed for. The subject of the photograph is a creek, looking straight across the creek to the far bank. The creek and the far bank are in bright sunlight. I was in woods, and deep shadow, when I took the photograph, and so the foreground is very dark. I converted the image to 32 bits/channel when merging it into HDR Pro, and used ACR to tone the final image. All of that worked very well.
But when I wanted to make some final little adjustments to the image, I found that I coulnd't! I wanted to select a color range, but the Color Range option was grayed out. I tried to use the magnetic lasso, but a message box popped up saying that I couldn't use that tool in 32-bit images.
I don't understand this limitation. 32 bits are supposed to be best for HDR images, but I can't use simple tools to edit the result?
And then when I switched to 16 bits, it seems I have to merge the channels first, but that loses all of the smart filters and other history that I had when working in 32 bits!
What is the best workflow for doing this? Is there something I am missing that would help?
Thanks very much!
RobR

Thanks again for helping me understand.
But I'm afraid I'm still a fair bit mystified. I'm trying to move away from why 32-bit is different from 16-bit and into what is the typical workflow for an HDR image where the goal is a realistic scene.
Are all edits typically done in ACR? Or do people accept the loss of the ability to use ACR when they switch to 16-bit mode to get the simple tools like selection, dodge/burn, and so on? It seems to me that the best of both worlds is to save the ACR-only version of the image and then convert to 16 bits and, once final editing is complete, to save that version separately? That way, should the ACR need to be adjusted, it could be done starting from the original settings, and only the 16-bit changes would need to be redone manually.
Thanks again.
RobR

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How can simple tools be used in 32-bit-per-channel images?

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