actually the solution to use multiple is to place the widget in different sidebar elements, and change the catched data to 0 on the php file of the plugin ->
if ( $tumblrcache[‘lastcheck’] < ( mktime() – 60 ) ) {}
to …
if ( $tumblrcache[‘lastcheck’] < ( mktime() – 0 ) ) {}
at least this is a quick and easy thing instead of rewriting the cache code 😉