Quick question here

No to both your questions.

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That's cool that you speak French Canadian. I just speak French.

Is there a way to clear quick play??

As far as I know, there is no way to clear quck play. It is essentially the same thing as your "recently played" folder (which also, cannot be deleted/edited).

I find it extremely useful for booting up current arcade games that I am playing. It seems to benefit me more than others I would imagine, as I have hundreds of XBLA downloads. If I simply go to my arcade games, I have to wait several minutes for the list
of games to load.

Its a quick way to access things like demos or arcade games you have downloaded.

if you want to delete them you need to remove the games from your hard drive.

if you want to add to it you need to buy more arcade games or download more demos from the marketplace.

Like others have said. It's a list of recently used or downloaded items. If there are items that are frequently used, it's a tool to access them without having to go to another screen. I use it pretty often myself.