In the original Hexxit server (before it was updated), I learned about drawbridges, which would place a line of the block you place in it, up to 15 blocks, in one direction when powered by redstone. I think it is interesting and could be very useful when making quest dungeons or large builds.
When I tried and saw that I couldn't craft a drawbridge, I was a little disappointed. I looked it up and apparently the drawbridge used to be part of the Tinker's Construct mod, but is not in the most recent version and was moved to the Tinkers' Mechworks add on.
I hope that this drawbridge mod will be considered because I think it opens a lot of opportunities for dungeon masters and builders.
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/wip-mods/1446244-1-6-4-tinkers-mechworks (http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/wip-mods/1446244-1-6-4-tinkers-mechworks)
The concept is simple enough, I may try include it in my mod..
It's really not worth adding a whole new mod just for that