The current, updated T-series comes with 2 transmission options: A manual 10 speed transmission, and a 5 speed automatic slushbox (torque converted automatic). My suggestion is to add an automated manual transmission (aka, semi automatic), as is also common to see in real life. So this is an automatic transmission with a clutch instead of a torque converter. In beamng terms, think DCT transmission, but with longer shifting times (because single clutch). And no creep please. If I wanted to creep, I would just take the 5 speed slushbox.