I understand what you were going for, as I'm running my own game. It gets to feel like too much when everyone declares an action before combat starts and then the DM has to wade through it and interpret things based on changes, etc. However there's really something to be said for being able to end a round of combat in a day, rather than a week.
I'm fine with whatever you decide to do, but what I'm finding to work is having everyone post intentions for the round, then stopping it in the middle if necessary due to a significant change in the situation.