Oh yeah theres actually a pretty neat way to mess around with character buffs if youre into testing stuff. You'll need to use the debug console which you can open with f2 or the tilde key, but make sure youve enabled it first by adding dbgconsoleon=true to your general.Ini file

the commands themselves are pretty straightforward once you get used to them. I usually go with addbuff to add stuff like for example addbuff('sprintstaminaregen') if i wanna test out stamina effects, and removebuff when i need to get rid of something. Just remember to wrap those buff names in apostrophes, and the capitalization has to be exact or it wont work

good to know: always save your game before messing with these commands. I usually type savegame followed by whatever name i want, just to be safe. If you wanna check if the buffs are actually working, you can use showstat('characterstats') to see whats going on. Makes it way easier to keep track of everything, especially when youre testing multiple effects at once. Just remember to clean up after youre done testing or your character might end up with some weird combinations of effects!