Re: you have a different version than me then - Edit 1
Before modification by Spoonman at 09/03/2010 11:53:31 PM
Although not all of them correctly change what the key prompts on screen show >_>
most importantly, it prevents the adoption and/or harvesting of little sisters, especially if you re-map the "use" key...
I remapped use to "E" and it worked for the whole game.
The PROMPTS still show F, but E is the button which works, and it works just fine.
because i made the same map and could not get it to work, neither when adopting little sisters or looting bodies. but of course tech support only says "we're working on a fix"
congrats to you for buying a version which works as advertised 
You should be able to hack by pressing left mouse, even if you remapped it. I had the same problem (changed from WASD to ESDF, couldn't use the new "Use" key I'd set up to stop the hack needle), but found online that you can just use the mouse to stop it.