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I had an idea, but I don´t know if this is possible: Drawing a square and scale it to the cursor, if the mouse button is released, it´s easy to check the selected things with collision.
Would this work in a way like this?

(I would also like to know how to scale, could somone make a little demo? )

It might, give it a shot

Look here. Maybe it is what you need

I thought collisions take a lot of memory. Instead, I would have used the coordinates of what you want to select to see if it's within the box.

Background>MouseButtonDown>Left>

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    draw=1;       
    xprev=xmouse;
    yprev=ymouse;

Canvas>Draw Actor>

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    erase(255,255,255,1);
    if(draw==1){
    setpen(0, 100, 255, 0, 1);
    moveto(xmouse, ymouse);
    lineto(xprev, ymouse);
    lineto(xprev, yprev);
    lineto(xmouse, yprev);
    lineto(xmouse, ymouse);
           }

Background>MouseButtonUp>left>

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    if(draw==1){
    CreateTimer("unit", "1", 100);
    draw=0;
    }

Unit>Timer>1>

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    if(x<max(xprev, xmouse) && x>min(xprev, xmouse) && y<max(yprev, ymouse) && y>min(yprev, ymouse)){
    selected=1;
    }

DST, Isn't this supposed to select multiple object inside the square ???