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You can expand the palette dialog by hovering over the right-border until the cursor changes to the adjustment icon then drag to the right to expand it. This exposes the scrollbar although when clicking the scrollbar physically, it registers as a normal click. 

That would be a really nice addition.  If I come up with any ideas I'll drop a comment here.

Really nice work! The animation is smooth as hell which is great. It feels like it should be part of Aseprite by default.

Sorry for the long wait in getting back to you. Things have been   incredibly busy at home.  Using the value    6 on line   11  resolves the tab lining up, but it does introduce a 1px black solid line :

Absolutely! Here are the lines, and what I changed the values to. It resolved the misalignment for me.

lines 10 through 12:

        <dim id="tabs_height" value="20"/>

        <dim id="tabs_bottom_height" value="5"/>

        <dim id="docked_tabs_height" value="15"/>

lines 162 through 165:

        <part id="tab_normal" x="2" y="112" w1="4" w2="5" w3="5" h1="4" h2="6" h3="2"/>

        <part id="tab_active" x="16" y="112" w1="4" w2="7" w3="5" h1="4" h2="6" h3="2"/>

        <part id="tab_bottom_normal" x="2" y="124" w="12" h="6"/>

        <part id="tab_bottom_active" x="16" y="124" w1="4" w2="7" w3="5" h1="3" h2="2" h3="1"/>

I noticed on your UI the tabs line up seamlessly. On mine there was a small discrepancy of 1px or 2. I updated the xml file to reflect the changes and now it lines up perfectly. The theme is beautiful, genuinely, thank you!

This is very nice thank you for sharing!