Freeze Rows / Float Rows in the timeline

[bendog]

There's been a request to add the ability to freeze rows.
I've had a look at the react-virtualized docs and it seems they don't explicitly support this, however you can use scroll sync + grid to achieve a similar effect.
I haven't worked out how, to be honest this level of front end dev is far above anything i've worked with before.

Any advice on how to proceed?