Safety is the same as before. Just don't use "SFall" tab and "Save sfallgv.sav" button there. I didn't complete load and save procedures for sfallgv.sav. Loading procedure aborts if encounters arrays, so if you save sfallgv.sav file, you will loose those arrays.
Only thing that can cause crashes is editing your inventory: changing existing item or creating new items. If you don't edit inventory, but game crashes, I'm pretty sure it does that with same frequency as if you didn't use editor at all.
Most common reason is the game installed in "Program Files" and system protection of files there interferes. If so, try to install somewhere else. If not, I need to know how and where did you install the game and the mod.