how to split scenes in imovie 11

i recently purchased an 8-core intel based mac pro to gain the video processing power over my old mac pro. Much to my dismay and frustration, the iMovie 6 interface that i had become extremely proficient at using was now completely different in imovie 11. For example, the simple scene-split command, apple+T, no longer exists, at least to my endless hours of searching and cursing. I have imported hundreds of hours of 8mm and VHS tape and must figure out a way to be proficient again in 11. Or, figure out a way to run imovie 6 on my intel based mac. Either is acceptable to me. Please help!!!!!