I know that, and I've also tried Sandbox+ but I personally don't like two things about that superpowers: you can't switch weapons, you can only use super punch; besides you can only use fire waves, there's no trace about electric waves: that is the reason that make me use the outdated one right now.
Just open sr3_city.lua, find these lines:
Code:
-- *** SUPERPOWERS WEAPON SLOT DISABLE SETTINGS
-- SUPERPOWER_SLOT_DISABLE = true (default) Weapon switching is slightly buggy so disabled by default
-- SUPERPOWER_SLOT_DISABLE = false enables you to use all your weapon slots when superpowers activated
SUPERPOWER_SLOT_DISABLE = false