Here's a link to their support page:
There are a couple of responses from Timely folks which state something to the effect of, "We'll put that on our list of issues to address." They've also said a major 2.0 update is on the horizon, and was to be released around the end of November, but that has apparently been delayed.
In the meantime I've stopped using Jetpack's CSS editor, as the Timely plugin really does seem to be the best, most user-friendly calendar plugin **that can import Google calendar ics feeds** available. Believe me, I've looked for alternatives.
For those interested, as a workaround I've placed a call to my external CSS file in my theme's
header.php file, in the form of
<link rel="stylesheet" href="http://domain.com/mycustom.css" type="text/css" />
I simply edit this CSS file in a text editor (Text Wrangler) which downloads and uploads the file directly to and from the server via FTP. It's not as elegant as the Jetpack solution, but it works for now.
I look forward to the day when these two plugins can play nicely together :)