Could we please stop using the term "time-attack" at last? A tool-assisted speedrun is not a time attack. Although they are somewhate related, they are nevertheless clearly different things. Just look at
http://en.wikipedia.org/wiki/Time_attack for a definition of time attack.
Some games, specially racing games, have a "time attack mode" (also called a time trial). It's a feature the game itself supports and the game will count lowest times as records. It has absolutely nothing to do with tool-assistance. It's just a playing mode (usually supported by the game itself). Some people may perform time attacks on games which do not directly support it, but it's still just regular speedrunning, no tool-assistance.
The term "tool-assisted speedrun" is a standard term among speedrunners and means exactly what we are doing here. For example the Doom speedrunning community has an entire subgenre dedicated to tool-assisted demos. See eg.
http://www.doomworld.com/tas/main.shtml
I don't know who started using the term "time attack", probably Morimoto himself, but it's wrong and misleading. We are not making time attacks, we are making tool-assisted speedruns. So please stop using that term.