In "Mount new virtual disk" dialog, replace the drive letter text box with a drive letter combobox with the 26 possible cases...
As already mentioned, having a fixed list of options may be a bad idea for some users. I'm not sure someone would use characters other than English letters in the GUI applet (as mentioned by Shao), but even showing all English letters might be a problem when some of them are already in use. Having all letters listed might give the impression that any one of those is available.
If IMDisk is installed in a non-English Windows version, then non-English characters should be listed too?
Moreover, when the user inserts a letter that is already in use, IMDisk asks whether to use that letter anyway, and if the user really wants it, then he can go ahead and use it. So, which list would be more convenient? The one with "all" letters, or the one with "available" English letters, or the one with "anything that could be used", or...? The answer depends on each user.
Additionally, there are users that would rather use the keyboard for this option, even in the GUI applet, so whichever list might be provided, the possibility to type in the field should still be allowed. I'd like to have the possibility to use the mouse in this field, but having the "adequate" type of list is not trivial IMHO, and maintaining the option to use the keyboard is important too.
That could be a good idea. Or some kind of list of suggestions that has been posted and discussed in other topics.
Unless Olof can temporarily close the access to pinned topics, and temporarily re-open them so
only Olof can add relevant information, and then close them again, I think the experience tells us this one could be a "bad" idea.
For example, the pinned FAQs topic should be used only by Olof, but was "invaded" with questions that should had been posted as regular topics. Only Olof should decide whether to add a question (asked in a regular topic) to the pinned FAQs topic with the relevant answer.
If that situation is repeated with some "requests" or "suggestions" pinned topic, then the pinned topic is useless to the general users, so why should be added? Just start a new regular topic and make your request / suggestion.
I don't follow, do you paste a path with path and filename surrounded by commas? Such as:
,C:\diskimages\image1.img,
Why would you expect that to work? It does not and should not. It is simply an invalid Win32 path.
The double quotation marks are added by Windows Explorer. For example, shift+right_click on an image file, then select "copy as path", and then paste it (in notepad, IMDisk or wherever else). The path is already pasted between double quotation marks, even when the path doesn't contain space characters.
When using programs that don't accept this type of notation (and IMDisk is not the only one), the user needs to "edit" the pasted path to remove the initial and final double quotation marks. Then the path is accepted in IMDisk.
I guess the request is for IMDisk to recognize these optional initial and ending double quotation marks if / when any one of them is present, so to understand they are not part of the path itself, so the user doesn't need to delete them manually if they are included in the pasted path.
... so don't be too much surprised!!! 
though most probably with a very limited practical use.
:
and before I forget about this 
, a link to "malformed" directory names (another "queer" thing):
