As for attacking together, I believe it can be done, but I am not so sure as to how it can be done just yet - Im still mastering this myself. (Although Im sure others can help you)
But Im pretty sure it shouldnt take too long to write a script or two that does what you want.
If you take a look at the default scripts in the "people" folder then you will see a cover fpi, shootclose fpi and a coward fpi. What you want involves parts of all those scripts.
The way I have been learning is to copy all the scripts I want parts of, and then try and continue one of the scripts using parts of others and following on in the same structure (following on with state consecs). Then test, test, test!
Theres an Fpi maker that is readily available on this board somewhere, Id suggest using this if its your first dabble in scripts, as it can validate your script before you try testing it, which can stop alot of head scratching before you even start.
So, In answer to your question, yes! Give it a go, just make sure you only work from brand new / copies of the default fpi's.
Let me know how you get on.
DAB Studios