Rather than just have the options hard coded for what to display on the left/center/right of the bar, instead allow users to create their own custom formatting using variables. For example, on the left, if we have the following variables available:

$haste = Haste %
$vf_stacks = Voidform Stacks
$vf_more_stacks = Additional incoming Voidform stacks

Then if a user entered the following:

$haste% - $vf_stacks (+$vf_more_stacks) VF

The output on the bar (for 51.23% haste, 20 stacks, and 8 incoming) would be:

51.23% - 20 (+8) VF

Pseudocode is pseudo; still need to figure out colors, in/out of Voidform behavior, etc.

Can you also include an option to add TimeToKill text to the bar? I've always modified the right text to show a time to kill timer instead.

TTK will have to come at a later date.