No - not mode 7 itself - it's a software rendering engine. Construct is entirely hardware accelerated, so it would make sense to do the same thing but in true 3D. However, we are concentrating on 2D features for up to Construct 1.0. Have you had a look at 3D Box?
The 3D Box is pretty cool but useless in my case. I've been working on a F-Zero style game and the mode 7 is a must. In real 3D it would look better but at the same time it would ruin the *16 bit game feeling* that is one of the key factor of the game.
If Construct is aimed to 2D game developers, then someone has to made a Mode 7 extensions as it is one of the most used effect in 2D!