Yes, a hole creation and editing tool is badly needed. I have been doing some machinery-like stuff recently and holes took a lot of time to do. A hole tool should at least provide such things as bore type, core/thread diameter, shaft/thread lenght and bottom type.
And while we're at it: A bolt/screw tool would also be nice, though a bit less important. I'm not talking a bolt library, just a tool that creates the most frequently used standard bolts from user input: Head type, thread type and thread/shaft lenght.
(Roman: It seems Firefox is working with the forum again, now!)