Not in the current version but I do plan on adding this in a future update. You can get a similar effect by doing this:
plugin command("UltimateUI.dll", "UI Load XAML", "<Border BorderThickness=\"0 0 0 1\" BorderBrush=\"Blue\"
Width=\"78\">
<TextBlock x:Name=\"hyperlink\"
Foreground=\"Blue\"
Cursor=\"Hand\"
HorizontalAlignment=\"Center\"
Text=\"Open Website\"/>
</Border>", "False", "False", "False", "BaseLight", "Blue")
plugin command