If you ever wanted to support an open-source project but you are not a programmer, here's one (of many possible) ways to help:
To quote from the announcement:
We’re hoping to build real subtitle support into Miro in the next couple months, but we need your help! So we’ve started a Kickstarter project to raise $1,000 to develop this feature for Miro on all three platforms: Windows, Mac, and Linux. Can you pledge to help make it happen? One of the great things about the Kickstarter model is that unless we can reach $1,000, your pledge won’t be charged.
(if you live in the United States, donations are tax deductible — we are a 501c3 non-profit)
There are 11 days left to make a pledge.