Motor Rock offers have ballooned to 25 keys (well, at least one bloke was willing to cough up as much). Time to make some money.
ES Standalone doesn't modify Steam's code directly.Unless he gets a job at Valve he can't expand upon the features of the client proper. Edit: Never mind!
I hope I'm around to share this moment with you, Jase - we shall dance a little jig together (or post Saoirse high-five gifs, whichever).

I'm hoping now that jshacks has begun porting ES to the client that he might be able to hack this feature in
ES Standalone doesn't modify Steam's code directly.