I never use the 50 as a price/MA or MA/MA crossover entry indicator, rather as a set-up indicator. So if price crosses above the 50, I start looking for an entry point, but the crossover is not the entry point. Likewise for exits, though I’m rarely still in a position that has deteriorated so badly that price crosses below the 50.
Right now, unless I can find a really concrete reason not to be in the trade, I’ll be looking to get long on every significant forex pair with an upwards sloping 50 (which almost certainly means price is above the 50 too). And vice versa.
I’ve got to think these days that entry patterns are relatively unimportant - what counts are reasons to take profit and reasons not to get in in the first place.