Hi Rebecca. There is a relatively quick and blunt way to change the volatility and a few a other settings. You'll need to either access the Repository via your WebDAV client or 'mount' the Repository in Windows. Table resource settings are written to simple short XML files which you can find in the Repository.
If you open these in something like Notepad++ you can see the volatility tag;
<TABFileDataSourceDefinition id="id1" volatile="true">
You can switch between false/true values here as required. And if using Notepad++ or similar, you do a bulk search and replace without needing to open every file. This is a blunt method though and you may want to refine your file search to just those needing a volatile setting, setting every resource to volatile would likely see a performance drop.
I agree with your sentiments on being able to specify volatility on upload as the main provided method through the web interface is clunky and doesn't allow an admin to see at a glance the settings for more than one file. From what I've seen on these forums UK to Australia local gov sector have vastly more resources in SSA than can be efficiently and effectively managed through the current level of admin tools provided.