d1cf9e77_erience_in_ArnoLand__July_2009__Yes_but___
[Heuristic] Flexibility and efficiency of use [Justification (From Nielsen)] Accelerators -- unseen by the novice user -- may often speed up the interaction for the expert user such that the system can cater to both inexperienced and experienced users. Allow users to tailor frequent actions. [Yes but...] 
Building in redundancy to support multiple styles of interaction would be a better way of putting this. However, this needs to be seen in the context of a broader design concept. For example, there is often this designer fetish for drag and drop, when often it is only the designer who wants to perform this action. Also, implementing drag and drop in one place, invites the user to try it everywhere and very annoying when it does not work as they expect it to. So pick these accelerators well and not just for their own sake.
User Experience in ArnoLand: July 2009
Yes but...