Feature Request: Roll-Under Target Number

[LadyLightning]

Is your feature request related to a problem? Please describe.
The target number function only supports roll-over target number (most dicepool systems like Shadowrun and WoD use this). But I am playing Infinity, where you need to roll under your skill level on d20's. Furthermore, there is a possible range from 0 to 5 where that result counts as two successes (0 means it can't happen, 1~5 means that natural result on the die), and a critical fail on a 20.

Describe the solution you'd like
I would like for there to be a function added that inverts the target number comparison, so that instead of checking whether each die result is higher than the target number, it checks whether each die result is lower, and counts successes accordingly. Additionally, there should be a configurable, optional range at and below which a given die counts twice, and another at and above which complications are tracked.

Suggestions for syntax:
tlX (target lower)
clX (crit lower)
fhX (fail higher)

clX and fhX should be optional,

For example:
!roll 2d20 tl12 -> Result [8], [3] Successes: 2
!roll 2d20 tl12 cl3 -> Result [3], [2] Successes: 4
!roll 2d20 tl12 cl3 fh19 -> result [20], [19] Successes: 0 || Complications: 2