Lack of interest Trophies: X posts in Y time period?

Target Practice

New member
First of all, my apologies if this one's been mentioned before (or worse still, is already implemented and I've missed it!), but one option I'd like to see added with regards to the excellent trophy system is the ability to set a timeframe for said trophy - IE: a trophy for making 50 posts in 30 days, or for being liked 100 times in a year. I assume that's possible without too much faffing around (sadly I'm no coder!)?