visbot/AVS

i'm having a coding problem here:
i'm going to make an avs preset that mimicks windows, but i don't know how i'm going to make it so a window border doesn't stop moving if you move too fast; it needs to check if getkbmouse(3) is still 1, even if it goes outside the detection threshold, like a real window would behave, and then stop moving when mouse3 is released.

also, it must not move if you hold click while outside any thresholds and then move into them

click=getkbmouse(3);
xmouse=getkbmouse(1);
ymouse=getkbmouse(2);

//check if inside the avs screen
inscreen=band(
band( above(xmouse,-1) , below(xmouse,1) ),
band( above(ymouse,-1) , below(ymouse,1) )
);

//mouse detection threshold for four sides of the triangle window
lthr=band( above(xmouse,xa-0.05) , below(xmouse,xa+0.05) );
uthr=band( above(ymouse,ya-0.05) , below(ymouse,ya+0.05) );
rthr=band( above(xmouse,xb-0.05) , below(xmouse,xb+0.05) );
dthr=band( above(ymouse,yb-0.05) , below(ymouse,yb+0.05) );
// Mouse positioning
xoffset=xmouse2-xmouse;
yoffset=ymouse2-ymouse;
xmouse2=xmouse;
ymouse2=ymouse;

oxleft=if( band(clickin,lthr) ,oxleft+xoffset,oxleft);
oyup=if( band(click,uthr) ,oyup+yoffset,oyup);
oxright=if( band(click,rthr) ,oxright+xoffset,oxright);
oydown=if( band(click,dthr) ,oydown+yoffset,oydown);