Well good news, I've been on Joomlancers.com and I've met someone great (Markat).

He coded the module and gave me his website's address where other interesting thing were there too :

www.galangph.com

I think the guy never sleeps, he coded that in 3 hours or something

Well, let's hope now for the same module displaying only online users (I'll probably pay for this one too).