I'd like to point out that RAW scouts have DD on their list (see the Errata) and rangers can get it and trapfinding in exchange for track. Also, rangers/scouts do benefit from high wisdom: spot/listen. And will saves.
Note then that the RV only applies to sneak attack. You could probably get it applied to sudden strike, but skirmish would be a stretch. Worth trying though. One level of cleric and Travel Devotion. Heck, make your domains either pride and travel, or air and travel. Swap out the domain powers for air and travel for the domain feats. If you have low charisma, no worries, buy night sticks. This allows you to move your speed as a swift action. You may want to up your wisdom by 1 so you can use level 1 cleric spells, there are some nice ones for a SH:
Blessed Aim
Divine Favor
Resurgence
Conviction (only if you don't have someone else giving you morale bonuses to saves)
Entropic Shield
domain:
Longstrider (travel domain)
Continuing your build, taking FE (evil) would be a good thing, you can get it via the Stalker of Kharash PrC in BoED. Two levels gets you FE (evil). Also, the Darkstalker feat is a must if you rely on hiding at all.
Equipment: +1 force, splitting, wounding, and then your pick of +2 from there. Seeking is nice. Masterwork tools of important skills (see PHB, 50 gp for a +2 circumstance bonus to skills) and maybe a competence ring (see DMG and MiC for custom item rules, skills are bonus^2*100 gp) for absolutely necessary skills. If you can reliably get SA damage (i.e., are successfully hiding) you can take a level of Sword Sage eventually and pick up the Assassin's Stance. Expeditious Dodge as well is something you might want to take (RotW), and definitely take if you need dodge (it can replace dodge). Boots of Striding and Springing, or really just the striding part, plus the Ring of Entropic Defense nets you a 50% miss chance vs incoming ranged attacks. Coupled with Air Devotion and hiding, you pretty much can't be hit.