Coming from Wurst there were a couple useful features that are not present in the ForgeHax that I think would be relatively easy to implement. Namely:
Jetpack hack, it allowed to not get kicked by the server for flying since the user could alter very fast between flying up and falling back down.
SpeedHack, self explanatory, very useful in some situations, it would be very useful for faster walking and running.
Glide hack, effectively a slow falling potion effect but as a hack, together with Jetpack hack makes a powerful combo for flying even when it is not permitted by the server.
Coming from Wurst there were a couple useful features that are not present in the ForgeHax that I think would be relatively easy to implement. Namely: