Feel like my total post have been stuck at 98 for the last 10 ones

edit: 100% sure it didn't jumped to 99 with this one. Forum has a problem.

Hi readers

Correct me if I am wrong, but basically mining is a lottery game.
The more high the difficulty is, the less probability there is to find the lucky number [to find a valid hash with the minimum number of zero in the beginning of it].

Trying to mine with 1Mh/s might make laugh many of you.
Yet, I wish to do something even more "useless".
I wish to mine using 10% of my CPU, or even 1% of it.
(until I learn how to set my GPU for the job, to NOT 100% also)

Is there a command line or a possibility to use only a fixed % of your hardware to mine?
Mining at 10kh/sec, that's still 864'000'000 picopicochance in a day to win 25BTC playing solo.

'might wait forever... or be freaking lucky!
Very unlikely, but not impossible.
That's a chance game. Not hardcore mathematics problem to solve.

I didn't success to find how to reduce the allowed %. 'goes straight to 100%.