Personally, in order to properly address all the MANY issues that arise with Phantasmal Force (and the later Improved PF, Spectral Force, and Programmed Illusion, which are all the same basic spell just with increased capabilities in what kind of illusion they can portray and how effective they can be) I just re-wrote the spell. It lacked any kind of sensible rules or control - I gave it that. It's now a much longer description obviously, but it was desperately needed. I'll put it up if you're interested. I'm certainly not the only DM who found it necessary to resort to adding a great deal of rules to it, to eliminate the need to always make up RULINGS on the spot to deal with the spell.My only question (which I floated past my DM and he wasn't sure) involves the verbal component. If your character is saying "Phantasmal Force" or whatever the spellwords are, wouldn't that be a bit of a giveaway that you weren't actually casting Fireball or whatever you're bluffing?
Just wondering if enemy magic users within earshot can freely ignore my illusion simply because they know I wasn't saying the proper incantation.
Short of doing that, the answers to your questions can ONLY be answered by the individual DM of a campaign, because those answers simply ARE NOT to be found in the rules themselves.