As a recurring donor, I would like to make the occasional one off donations

[nanorepublica]

I currently have a recurring donation setup which perfect! However due to exchange rates the amount I would like to give (5% of revenue) varies, therefore I would like to be able to make a one off donation from my donation summary page.

The donation summary page is the URL that gets created for each donor once they make a donation. I would like to be able to make donations from this page so they do not create duplicate donor entries.