I'm trying to use the type tool to type in the densitometer reading I just read with the Eyedroper Sampler tool. As soon as I start using the text tool, then numbers from my sample on the Info Palette disappear. Why should they disappear at all. Please add to the wish list.
This isn't something I've had a need for, but have you tried using the Notes tool instead of the Type tool? You can type the numbers into the Note without them disappearing from the Info panel.
If you then need to actually include those numbers in the image itself, the numbers won't disappear from the Note when you switch to the Type tool. A two-step process, but it does work.
Pretty much everything in the Info panel disappears when using tools to create new objects/paint, etc., thus forcing a screen redraw. Maybe there's a conflict there. Maybe they even have to assume that the creation of new pixels/vector objects will change the readout under the sampler. The sampler info returns as soon as you aren't actively using these tools, though.