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.
Yes, there are no limits to bitcoin purchases. You can purchase everything Steam offers directly - and even if some items, or in game transaction would not accept bitcoin payments directly.
After all there is option to add funds to your Steam wallet via BTC payment and then buy anything you want.