It's actually more than 14 class points, from where you're at to level 50, by the by. There's an extra glut when you hit 50, though I forget the exact amount... somewhere between 5 and 10, in any case. Something similar for generics and stat points. Either way you'd have just about enough to go 4/5 or so in any two talents between stealth and assassination, which'd actually be pretty solid if you're leveraging it for specific junk. 1/X/1/X in stealth, where X1 is whatever and X2 is however much it takes to stop giving duration boosts, then 1/1/X/X would give you a vaguely disgusting amount of upfront burst and a nice silence + unarmed procs, though you'd probably want to dump points into combat accuracy instead of the skeleton tier 1 racial, in that case. Basically ignoring the general defensive aspects and leaning on shadow dance to give you a few turns of significantly increased crit multiplier (which is particularly huge considering your crit rate is already up there) and assassination to pile on more pain. 8 points upfront to get every talent in both trees active, leaving you two flex at the time of your post and another 10-ish left over at 50 to stuff where you can, with priority probably going to dance and shadowstrike or marked for death.
As for snap, it is fairly expensive, but it's also kinda' ridiculous with higher investment (though if you went for the above, higher investment wouldn't really be something on the table. 4/5 is a full reset on 7 of any of your combat or cunning techniques, which effectively means you get two full rotations before having to wait on cooldowns, instead of just the one. Incidentally, while I totally hear you about the micro, swift hands + one of the second wind active body armors could help quite a bit with the costs, ehehe.
Prodigy wise, though... spine would do you. Considering the lower/lack of cooldown, it's possibly even better for a long fight. Buuuuut temporal form is upfront, blocks most of the same things, and gives you some non-trivial talent access on the side -- two sources of teleportation, an area pull, and a -res debuff to hit things with, mitigating some of that physpen concern you mentioned (and the damage conversion helps with that, anyway). Plus storm, which is less interesting but still might be a'ight AoE damage. You'd just have to pay attention to it, and the CD is actually meaningful, heh. Think I'd probably recommend spine anyway, just because it's passive, but it's possibly worth thinking about. Also fairly sure cauterize pings shields, though it bypasses resistances and whatnot, so it'd still be pretty fine for a shield heavy build.
Last bit, at th'mo, would definitely recommend evasion over light defense or skellie racial, regardless of whatever else you do. A few stat points and some defense isn't all that impressive at the point you're at, but four turns of an extra 30-ish % chance to avoid non-spells (that can be affected by snap, by the by, should you put points into it, which would double the effective duration) is nothing to sneeze at, and the defense boost isn't exactly inconsiderable, either. It's something to consider, though it's also yet another talent to keep track of, and a fairly expensive one to boot. At least has the decency to be instant use, ha.
E: Well, last bit except to note re: chat's talk on stat investment, the critical multiplier from shadowstrike + dance would most likely give you more damage than just about any strength investment you're capable of could, at this point. If you're looking primarily for more damage output. Crit multiplier is probably the best damage stat in the game, late game. Stat wise, I'd... probably recommend checking if any of the runes you're using or want to use scales off a stat you don't have maxed, then go for that one. Doesn't look like it, giving a check, but it's a thought.
E2: Ah, and amusing side note re: trapping: There's actually an insane or madness, iirc, rogue win in a pre-1.5.0 build that went with heavy trapping and staff use, of all things. Basically took shadowstrike and gravitic trap and then did horrible things to everything. It was pretty hilarious, heh.