One thing to note here is that a Ranger does NOT need the same Dex others do for 2WF, they're auto/class feats. Most NON-rangers go 15 DEX +2 tome, but that's a waste on a non-AC ranger.
For a Dwarf DPS ranger with rogue splash, I recommend 13 DEX. Especially if you want Rogue skills beyond UMD you'll want those 2 build pts elsewhere. I also recommend considering 17 STR at start vs 18, those 3 points add a lot of flexibility too.
On recently lesser +3'd my old Dwarf 15/2F/3Ro to 18/1/1 and went 17 13 15 14 11 6. 14 INT allows Search/Spot/Disable/UMD (he orig skipped UMD, this was added in the reinc)
http://my.ddo.com//character/thelanis/gimmel
I'm not really sure of anything I'd change, I'm really happy with this as is. He's got one Min II and decent offhanders and other weapon sets for almost everything now. Great DPS and while some don't care about it I love the full rogue skills. (You might get the hint I'm partial to rogues from this and the Rogue levels in the Warchanter in my sig. You'd be right.
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)
Otherwise, if you don't care about rogue skills, 10 INT is fine and you get 18 STR / 16 CON and still full UMD.
TC
PS you can't dump Dex below 13 however as that's what you need for Dodge and hence the full Tempest line.