Legerdemain max Rank is 20. You can check out as much info as I have gained for it HERE. Slotting more Vampire abilities does level the tree faster just like any other Tree. As for WW, it makes no difference, you can hit Level 10 in less than 1 hour with only the xform and Pounce on the bar.The skill trees themselves each level in a different way.
Soul Magic - Levels via main story completion, max level 6.
Werewolf - Levels from kills in WW Form, max level 10.
Vampire - Levels from experience earned, max level 10.
Legerdemain - Levels via stealing/picking locks, max level unknown.
As for if slotting the Vampire/Werewolf active skills I don't know if they will increase the EXP earned in those skill lines.
Okay. Yeah I cant for the life of me, find any info on the skills specifically. Wondering if I need to bother having the unmorphed versions of some skills on my hotbar.
No worries, it's still a work in progress as once you get past Rank 6-7 or so it gets much slower to level up each day. Not sure that I'll cap it in a single week but I at least want to beat my Rank 13 in 1.6 this week while NA has PTS. I'm half way to 12 now so should at least be able to get to 14-15 before our week is up.@DeLindsay thanks for the link and more so thanks for taking the time to write up your data.