Yes it is but not all at the same time. As stated, you can reset the perk points if you have beaten the main questline for the Dragonborn DLC. You need to spend a dragon soul every time you want to do this and can be helpful if you want to swtich from a warrior to a mage or mage to warrior. There is a nice glitch that allows you to equip nearly infinite amounts of armor. You'll need a follower, a key to a prison, a set of armor (helmet, gauntlets, boots, ring, necklace, ect.) and a medium to high sneak skill with many sneak perks unlocked. Here is a link to a video that will show you how to do it.
There are also many hidden chests such as the one in Dawnstar or outside of Solitude.
EDIT: There are also chests hidden in Windhelm that require a follower to get. Here's a video for those chests and some others as well.