If substituting with active dry yeast, wait 5-10 minutes after mixing with warm water (until it is bubbling) before adding the rest of the ingredients.
You can use all wheat flour if you like, but it will make for a denser, heavier loaf.
You can use all AP flour for a lighter white bread, but if you do, skip the wheat gluten.
For a less sweet wheat bread, reduce or eliminate the sugar and/or honey.
You can substitute plain leftover mashed potatoes for the potato flake mixture but water it down just a tad. You will need just under a cup of plain, runny mashed potatoes.