Most people avoid using power screwdrivers/bit drivers on bikes due to the ease with which damage can occur. However, now there is a tool that opens a new way of operation for power tools, completely intuitive,
DeWalt gyroscopic screwdriver. Does it read your mind? No, but it reacts to the way in which your hand acts when using a regular screwdriver, so you become capable of using a power tool in subtle ways, without really thinking. It is an absolute revelation. For a small power screwdriver price is quite high - mine is an inline version - but once you start using it, the tool becomes practically integrated with yourself. It is my primary tool now on the bike and elsewhere.
No connection to DeWalt or its distributors on my part. I ran into it just by looking for a small in size but effective power screwdriver.