Lattice modifiers can be added quickly, and lattice control can be added by selecting a block in edit mode.

Install

Usage
3DView -> Context Menu -> LatticeHelper

Entirety
All selected objects as a single entity

Bounding Box
Use the bounding box of each selected object as a separate lattice

Selection Block (Edit Mode)
Add a lattice for each selected block as a separate region within edit mode

Entire Block (Edit Mode)
Add a lattice for all selected blocks within edit mode as a single region

Apply Lattice