There's a similar mod (PymTech, by Lucraft) that provides functionality to shrink, but also provides an option to grow. The primary reason I haven't been using that mod is the library it uses seems to cause instabilities. Would you be able and/or willing to implement of "Grow-to-Giant-size" feature?

Secondly, would you be willing/able to implement a potion effect or food item which changes one's size (as opposed to a device or piece of tech)? This would allow the mod to fit into more fantasy or magic-themed packs a bit better.

Sizes will be configurable in the next version of the Mod, The Mod has a full API so adding items to do this would be easy.