Moved the explanation for this here because the Description for the mod was getting too long:

The power of the overlord's army (up to a max of 10x) reduces subject liberty desire... and the inverse is true also...
A wealthy subject can drive for independence by building their army - you don't necessarily have to use it...
Overseas subjects will now receive less liberty desire reduction from the overlord's army, if they have a powerful fleet to stop you from landing.
...and having a powerful fleet will add liberty desire all of its own to these subjects, up to +2.00

BASE Liberty Desire has been totally removed and replaced with Legal Friction.
Legal Friction specifically relates to laws that impact how governments interact with each other, and the value of wealth-owner groups' investment options and returns.
Weekly liberty desire of subjects based on differences between their laws and yours for these areas cannot be mitigated except by having the same laws.
The range of possible values for Legal Friction is 0->0.28 LD/week, but you should mostly expect values in the range of 0.08->0.16.
The impact of Overlord Prestige on reducing liberty desire now scales through 5 tiers. This has diminishing returns as each tier requires you to have double the prestige of the previous one - but there is a step-change; each threshold has a small jump before the scaling kicks in.
The default scaling modifiers have been entirely reworked.
They've been renamed to represent what they actually are - natural resistance to change in the Status Quo.
In addition to vanilla scaling (which could never be more than half of the speed of change), they now include amounts that are independent of how fast LD is changing, and are instead related to how close to the ends of the bar you actually are.
- A subject trending towards 0 LD will gradually develop up to 0.4 liberty desire flat (0.01 per point below 40)
- One trending towards 100 LD will develop up to 0.25 liberty desire reduction flat (0.005 per point above 50)

This is intentionally biased towards keeping subjects away from 0.
The further liberty desire falls, the harder vested interests in the country will resist loss of autonomy.
The more it rises, the stronger those who fear violence will try and fight to prevent a crisis. (But this effect is weaker.)
A strong subject will overcome the resistance at the top end much more easily than an overlord will suppress the resistance at the low end. (The AI will build their armies if their economies support it - players often under-build their armies as subjects, building your army is how you overcome resistance when you're strong enough to go it alone.)