Lua and Tolua should be default off because they are non-essential in the snese that they are not required to run CEGUI or the CEGUI SampleBrowser and are also (assumingly?) not used by a grand majority of users.
Steps to reproduce: 1. Download CEGUI dependencies package 2. Startup Cmake for the folder 3. CEGUI_BUILD_LUA and CEGUI_BUILD_TOLUAPP are switched on - should imo be off