garageCube

I want to change the sequence in which certain images appear on my mapped objects, but madmapper has no timeline or anything that looks like it will let me time/synchronize images. Is there a way to do this on madmapper?

You can use a MIDI, OSC, DMX sequencer, Ableton Live, Vezér etc.
A lot can be remote controlled in MadMapper (from menu Controls / Controls List... => press the "+" button on the left, you'll see all controllable parameters). You can choose the media for each surface by number or by name (from OSC only)