You can emulate a logical OR with a function. As pictured here.
<img src="http://www.freewebs.com/johnwof/or.PNG" border="0" />
A simple reversal of the logic could also emulate a logical AND... but it's quite useless considering Construct already does that ! <img src="smileys/smiley17.gif" border="0" align="middle" />
edit: Oh, I almost forgot... just call this function in a condition like so : System -> Compare two value
1st value = Function.Call("OR", statement1, statement2...)
2nd value = 1