Selecting Multiple Opportunities for Responding/Calendar View Settings

WE have a large number of opportunities and with our process our volunteers respond to the majority of their opportunities for the year at one time. We have to split up our opportunities such that we have 240-60 opportunities for a year totaling close to or over 500 shifts. It's nice that a volunteer can select all the shifts in a given opportunity, but it would also be helpful for our volunteers to be able to select multiple opportunities all at once, especially since the opportunity filters are not terribly user friendly (automatically resetting after responding to an opportunity).

So that brings up a secondary recommendation that the filters for viewing opportunities don't reset. They should stay at whatever point the volunteer was viewing them. For example, in Calendar view, I'm setting my yearly calendar in January. I go to June, respond to an event, and then when I return to the calendar view, I'm back at January again. Then I have to click all the way through just to get back to June. At the bare minimum, I would think there needs to be a better way to get to various parts of the year rather than clicking through all the months.