Hi,
It sounds like you are describing iMovie.
I take it that you don't like the "magnetic" feature where clips added to the timeline click together and cannot be separated with spaces in between. True, that's the way iMovie works. However, you can add black backgrounds as spacers to separate the clips the way you want.
If you want total control, create a project and place a black background in the time and adjust its duration to the expected length of your movie. Then put your video clips in the auxiliary timeline above the black background. You can slide them around to where ever you want. You cannot add transitions, but you can put your cursor on the clip and two slider fade handles will appear in the upper corners of the clip. You can slide them to create a fade at the beginning and/or the end. If you hold down the Option key you can move one slider individually.
I haven't used any other video editor than iMovie, so I don't know about the features that other video editing apps might have.
-- Rich