I write left-handed, but am fairly ambi with a lot of things, so "left-biassed ambilateral" is probably the best description of me. I'll usually place a cup or glass to my left, use a spoon or chopsticks with my left but knife and fork conventionally (early training there, I guess), but when using tools I'll tend to use whichever hand gives me easiest access. I swap mouse hands every now and then to reduce the risk of RSI.
Some people have found it odd to watch me swap screwdrivers, hammers or drills between hands and carry on working. Mind you, I find it weird to watch people who normally hold a knife in their right and fork in their left pick up the fork with their right hand when they aren't using a knife (because to me if you are used to using a fork in the left surely it should be easier to carry on doing that? I guess this is because I don't have the experience of being so lateralised that it overrides practice).