I thought so as well LuxXeon but for some reason I couldn't get the mix shader to work as a single input strength adjustment in the cycles engine. In cycles what ever I put into the mix shader is what I got out, which makes sense. In 2.8 and the eevee engine I could adjust the strength of what came out. Say the texmap, adjusting the mix shader between 1 and 0 gave me either the full map applied or no map at all applied and .5 being a half strength map. And yep this can be done in cycles but with more nodes to adjust the factors. As far as eevee goes not sure if it is a bug or not though, but does leave for some interesting results.

Incantrix