I've been considering the idea of a pre-set customized build rather than the recommended build option.
I wish it were as simple as being in-game, and allowing the user to drag an item up to the top 6 slots to set your final 6 items in the order you want. Then just allow this to stay pre-set for every additional game, and have a little "reset to default" button in the options menu or something.
It would be simple to do on several ends, and easy to use.
This is the only thing really bothering me about LoL as a whole. I have to shrink the screen down and check my build to remember what I am buying sometimes. Takes me seconds, but to facilitate that in-game would be nice.