If you mean JIT, then I'd recommend looking at PyPy, also other JS engines and Java HotSpot, to see what other techniques are out there, when they work, when don't and why.

Ultimately V8 is almost an ecosystem in itself, it's embedded into quite a few other software, the ECMA262 standard is continuously changing, the Web is changing, Chrome changes on top of all this, plus there is a lot of backward compatibility stuff.

You can look at the V8 bugtracker pick a task and try your luck.