If I remember right, there is also a seldom used track from the north side, access via the lake or the road from the back of Kawerau through the pine forest that also goes to Tarawera falls & the lake
Yes there is, I've climbed it twice via that route, a fantastic climb. I grew up in Kawerau and this is the normal route we always used. It's still there if you know where to find it, I drove up there today to check it out, might actually head back and climb up soon to check whether the track's still passable. Here's how to find it:
First go to the Info centre in Kawerau (at the bus station) and get an access permit for Tarawera Falls/Lake Tarawera. It's only $5 and they'll give you a little map of the forest roads.
Head up through the forest toward the lake. 9km past the junction between the routes to the falls and the route to the lake (about 1.5km before the lake), turn left into Edwards Road (the turnoff is unmarked, although it's shown on the map they give you at the information centre).
Head down Edwards road for 1.2km, then turn right down an unmarked road. As you head down this road you'll see Mt Tarawera directly ahead of you.
About 1km down this road you'll reach the edge of the pine forest at the base of the mountains foothills. Park your vehicle here and walk up the slightly overgrown road that branched to the right. About 100m up here, you'll spot a trail leading into the bush, this is the trailhead leading up the mountain. A few metres into the track you'll see a DOC sign saying that the track has now been closed to public access- but realistically I doubt anyone's going to find you up there!!!
As for whether the mountain should be removed from the list, I think there's a a good case for it- and yes the price tag does stink of commercial exploitation.