Thats not a bad idea, but this would belong here.
I don't get why people make useless posts such as these, why not contribute to the actual discussion instead? :\
This is actually quite a nice idea in my opinion. For those who use AlcaRobot on IRC, it's not too much trouble and there isn't really a need to look through the add sprites dialog since we can just use !ar sprite 0F (to return the name of sprite 0F) or !ar sprite goomba (to return the sprite ID of the goomba). Speaking of that, I wonder why there isn't search box or something like that in those dialog boxes, I'm sure it would help people find sprites more easily.
But anyway, with this idea the sprites are already in the levels so it would just be a matter of pasting them in your own ROM. Also, it can work with some basic custom sprites like the Hammer Bro, Shyguy and Venus Piranha plant (you could make a level with SMB2 sprites for example) since usually many people who use Sprite Tool tend to include those sprites in their hacks.
In short, I agree with this idea; it would be very convenient for many of us.