You can get entity ID now by just hovering over the entity in the editor and it shows the ID in the status bar. Also, you can put a command in an entity's init function to store the ID globally and then access it from other scripts. Having to run a test level, walk up to an object, and then press E to reveal the info is not really the best method.
System Specs: OS - Windows 7 Home Premium 64-bit SP1, CPU - AMD Phenom II X4 945, 3.0Ghz, RAM - 8Gb DDR3, GFX Card - 2048MB NVIDIA GeForce GT 640, FPSC-R Version - Beta 1.0071