Just wanted to clarify something:

Rolling Force die is done as an action.

Each Light Side result generates points for use with powers.

Each Force power used is also an action.

Commit Force Die means you roll the die as your Force Power's action.

Can I store up Force Points across several actions (similar to double-aiming)?

Are Force Points like Destiny Points but just for my character and Force powers?

Can I spend Light destiny points to use Force powers?

Thus far I've played by choosing a force action and rolling the die, but the wording of the book implies I need to store up Force points as resources that I can then spend. Have I been using the Force wrong?

Using a Force power is an action, which involves rolling one or more Force dice or committing one Force die. The committing or rolling is not a separate action to using/activating the Force power, it is the actual activation, therefore they are the same.

And no, afaik, you cannot save force points over rounds, they're generated spent and whatever not spent is "lost".

To clarify: you can either "spend" or "commit" as an Action, not both at the same time. So for the Sense power: as an Action I can either commit a die to gain one of the ongoing effects, if I've bought into both; or I can roll my force die/dice to activate sense life or emotions (or if I've bought the "read thought" upgrade, roll to activate that).

The only way to increase the chance and number of light side (or dark side) force points is to increase Force Rating, yes. It seems harsh at first glance perhaps, but considering the difference between 1 and 2 Force dice is pretty significant: the FSE in my group increased her FR a few sessions ago, now she reads emotions, thoughts and senses life more often than not, before that, she rarely succeeded without spending DP and taking strain.

With 3+ dice it seems from other people's tests that you're pretty much set as a force user - with what is currently available of powers and stuff.

Flipping a DP to produce a force point could work - but in a way you already have that mechanic when you only produce the "wrong" type of pip. Considering the power of some of the force powers, like Move, having more (and "easier") ways to produce force points could easily and quickly become unbalancing.