Have you tried the Xbox Live Arcade remake of Lode Runner? Not sure whether it locks scrolling, but it appears to be quite close to original version.
You might also look for Lode Runner: The Legend Returns, a 1994 DOS game that might be fully playable using DOSBox (version 0.65), or Lode Runner 2, a 1998 Windows release - they seem to be available on eBay (not sure whether it will be happy with Vista/7 though).
Just learned about an improved version of Lode Runner: The Legend Returns, namely the Lode Runner Online: Mad Monks' Revenge, a 1995 game for Windows 95. The best thing about it is that although it had been commercially available, it was released as freeware and can be freely downloaded from its official webpage.