You've pretty much covered the field there, Dave.
The only things I'd add are one of those telescopic magnet thingos (having had four 4-engined bikes, I know they all have a black hole installed in the engine V, and the only way to retrieve bits that disappear is to either turn the bike upside down and shake it, or probe away with a magnet on a stick.
Also, I have a pair of needle-nosed vicegrips that I've used possibly more than any other tool - not for bastardising nuts'n'bolts, but for holding things. It's also the only thing I can use to remove the restrictor from the Satantune.
A friend of mine in the US bought me a set of those ratchet spanners when he was collecting parts for me. They cost him US$10, and sell here for ~$50. They're not as good or strong as a socket set, but very useful for confined spaces.
A hot air gun can be useful too.
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