I'm not asking to max his 2nd spell, just one point is enough. At lvl 1, it gives you +20 damage to all heroes on the map which is like a free phase boots. Heroes like SF and Invoker who have low base damage can really benefit from this. Using W while jungling is not efficient since you are already low on mana.
When jungling, I do agree with the fact that you need to suicide at least once as it saves more time. Just make sure you have already bought everything up. Moreover, if you are going the jungling route anyway, I prefer picking up clarity potions over tangos/salves.
Leaving the lane for your supports is never bad, supports needs the levels and some cruicial gold to make necessary items like mech and force staff so it never hurts. Also I believe Lycan isn't you Macho Randy Savage hero that can just go in and do anything he likes, for that a BKB is a must. Instead, he should focus on split pushing and farming. He is one of those heroes that can easily exchange for 2 towers while the enemy team is busy taking one tower.