I have tried making pumpkin and fruit shortcake rolls but each time my cake cracked when I unrolled it. Should I have let it cool longer? Did I unroll it too quick? My family and I love them but this has been my only issue with them (even though no one has ever complained)! Any tips?
Perhaps you are confused by the different terms used for the roulade cake. Shortcake, aka a biscuit, is not the same biscuit cake used for roulade.
When a roulade cake is referred to as a biscuit, it's the French usage of the word not the American. What Americans and British call a sponge cake, The French call a biscuit. The sponge cake is the correct cake for a roulade. Not a shortcake biscuit.
Try Rose Levy Beranbaum's recipe (link below).
Since there are so many variations on sponge it's important to use a recipe that is proven to roll well.
The first roll is critical. Aside from using a reliable recipe, The key is to roll while it's still warm. It has to be done right out of the oven.
The towel technique works best. See link to video.
After UNROLLING it's important to let the cake cool another 15 minutes or so before you add the filling and rerolling.
http://www.realbakingwithrose.com/recipes/RLB's Biscuit Roulade.pdf
Joy of Baking uses Rose's recipe and has a video.
http://m.joyofbaking.com/cakes/SpongeCakeorBiscuit.html
How to roll with a towel
http://www.finecooking.com/article/how-to-roll-a-roulade-cake