Larsiak, there are no option for shield mastery because it's included in the stats you provide yourself, like cruelty.
And I wasn't sure that 1h mastery modified shield slam so I didn't add it. I've read it didn't apply to shield slam.
But about the block value, since it's not on your char screen in game I could do:
a) keep it as it is, and let you go up to a hard hitting monster and notice your block, or have an addon calculate it for you
or
b) make you fill out your block from gear and your strength and then let the sheet calulate it for you
The formula for block value is talented str/20+block_value_from_gear*1.3. The shield mastery multiplier doesn't affect the block you get from str strangely enough.
I could add impale as an option, but I ain't adding deep wounds.
Keep it coming and I'll update it when I get enough feedback.
