To change your Sims traits, use CTRL + Shift + C and type in testingCheatsenabled true. Use Shift + Click on the Sim whose traits you want to choose, then click "Modify Traits". Select the traits you want to add, and voila.
I'm not sure if I'm thinking about the same flower, but when you die, if your Sim has it in their inventory the Grim reaper will receive it and they will be spared.
http://www.digitalperversion.net/gardenofshadows/index.php?topic=13641.0 http://www.modthesims.info/download.php?t=359375 For info on how to install them, go here: http://www.sims2wiki.info/wiki.php?title=Sims_3:Installing_Package_Files#Using_TS3_Packages