You can always compress them with something like Motion JPEG, which is basically a series of individual JPEG images wrapped up into a single file. It will provide some modest compression while preserving most of the video quality.
Also, Motion JPEG allows you to edit (split and combine segments) on ANY frame. Most codecs work by transmitting a reference frame (often a JPEG image) followed by a series of difference frames. You can only edit on the reference frames without getting bad artifacts at the transition, and the higher the compression the fewer and farther apart they are.