I do not like the idea. At least as far as what the op is asking to have it for anyways.
The OP is complaining that he is getting caught in the blast of a bomb radius when he drops and adding a time delay will let him safely fly ought of the blast.
What It appears is being asked for is to allow bombs to be dropped at such a incredibly close distance to the target that missing becomes irrelevant.
If you're getting caught in the blast from your own bomb you are flying too low and/or not pulling away from the blast area. If you do this consistently you are supporting the definition of insanity. This is not something that is hard to master, or something that requires a lot of in-game knowledge or skill. It is common sense!

If you keep getting caught in your own bomb blast, FLY HIGHER.
Adding a delay could possibly, depending on the delay, be used more like a mine against pursuing fighters as well, and I do not think many people would want that.
I can not think of a single target in AH that would be beneficial to use time delayed ords against, except perhaps to dump on already destroyed buildings so when they pop they get destroyed again. I do not think that would be very good for gameplay.