How to override snap-grid placement?

How can you temporarily override the snap grid in something like the blend space axis graph? For example: You have a 1D blend space axis from 0 to 375 with the default grid line count of 4. How can I place an element in a spot not on a grid line (like at 80)? In other apps, I’m used to using a modifier key (like Ctrl) to enable placement off of a grid line.

Yes, I know I can turn snap grid off and also define 375 grid lines but I am looking to temporarily override snap grid placement for just one object and not all of them so that I don’t have to constantly go back-and-forth with toggling the snap-grid enable setting.