Easier ways to get more mobs places and things to make building better.

I think we should be able to craft bigger boats to make it easier to get across oceans with mobs like cows, pigs, wolves, cats, pandas, etc. or even make it so that we can tie the boats together with leads. Also for the building idea, I know you have said no to this before, but please add vertical slabs. It would make building more fun and maybe even more realistic. It would make for a even more fun building experience in Minecraft. Same with stairs, make it so that we can place them on their sides. Again it would make building more realistic and fun. You don’t have too obviously it’s just a suggestion.