Canon EOS 450D - Easier way to use??

I seem to be finding it very awkward to use my Canon EOS 450D with iStopMotion as there is no live preview. Also having to click the preview button then the capture button (to add it to the timeline) instead of just pressing one button is difficult to remember and often leads to mistakes. Is there any easier way to go about it, perhaps one button that will place my preview directly into my timeline?

I am new to iStopMotion using Canon EOS 5D Mark II and 7D

(edit) My issues are solved successfully! :—)