I haven't used ST3, so unless you describe specific shortcuts with a clear definition of what they do in the context of the C2/C3 editor, I won't know what you want.
Sorry, Ok I'll try...
When you hold down the hot key, in ST3 it's Ctrl-P, then start typing, a small window pops open at the top of the editor window that shows search results across all files in your project that match what your typing as you keep typing. The truly awesome part of it, is the fuzzy matching. You don't have to bother with typing spaces or special characters when searching. It finds the characters you type actually across word boundaries. It's highlighting the results as it matches so you just type a few characters, then press enter to instantly jump to any file in the whole project structure.
I think what could be an even more awesome feature for C2 or C3 would be to do the above, but jump to any event/function definition in any file. With this feature you could jump around your code, anywhere in your code, nearly as fast as the ideas/solutions pop into your head. Can you imagine it?