I don't know of any issues with this. It's frequently used by banks I have worked for, you just give them an extra vacation hours, personal day or extra PTO hours. We've done it for staff appreciation, sometimes we've offered gift cards or paid day off and they got to choose. I've personally been awarded extra vacation time when I worked on a really long difficult project (core conversion), I was awarded an additional 2 weeks vacation.
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"The reason I talk to myself is because I'm the only one whose answers I accept."
- George Carlin