Wishlist for previewing builds on a slide

I can’t find where to post feature requests so I hope this is okay.

In Keynote for the iPad (I don’t know if it applies to the Mac as well) in the Build Order panel, when you click the PREVIEW button, it plays the entire slide from the beginning. When I have a slide with A LOT (!!!) of builds in a presentation that runs automatically and I, for instance, only want to tweak the last build on a slide, it can take forever to complete work on that slide.

I wish that PREVIEW would start on any build I have select and run from there until I stop it — in a similar way that PLAY starts playing from the current slide. And when previewing, any builds prior to the selected one should already be built.

This would be a HUGE help!