I'd rather buy games directly with my bitcoins rather than to fill my wallet with bitcoin first and buy games with it.

Not sure what you mean.
i mean rather than top-up my steam wallet with my bitcoin first i'd rather buy games directly with my bitcoins.
You can and Bitcoin has been an option since BTC was at around $415, at least that's what the video shows. This past week and most of last BTC has been over $440. Also Steam accepts Bitcoin for what seems to be all purchases on the store, including hardware.