Sorry, not via “checkbox” options, and not for the excerpt length as long as you are using the automatic theme styling of [show_posts].
There are two workarounds:
1. Create per page custom CSS rules. For example:
.page-id-577 .entry-title {font-weight: bold; font-size: 12px;}
.page-id-577 .entry-summary {font-size: 9px;}
2. Check the “Disable automatic post display integration with Weaver II” option. Your posts will then use a somewhat generic styling, but then your .atw-xxx CSS rules will apply, as well as the excerpt values. This can be on a Per-Filter basis for the excerpt length, but not the .atw-xxx rules.