Unlock mods option is the absolute best... Its a bit odd though, are the options supposed to re-lock when you exit and re-enter the gear mods menu?
Are you sure it isn't just the cosmetic color change?
When I first used this, I thought the same thing, that everything reset. Activated then when going back in, all the mods reverted from the green color. However, all the mods were still active (says active in lower right corner) and could be disabled and re-enabled to my preferences.