what are shifter stabilizer bushings?!

i found out around 6800 I can shift but i have to wait a second
i can't slam it right into second or once in a whiel i get a grind,

at least i know im not the only one,

anyone else have a slow oil leak problem from above the oil pan? (prolly everyone)
any suggestions, i want my engine to be clean,
94' LS 5spd 70k miles, i dont want no oil comming out at all,
its not bad but i want to clean it up.