All the modules have at least an advanced flight model, with the exception of the Fulcrum and the Flankers.
When you cycle through, for example, bomb intervals in the Su-25A, you can see the switches move, but I think the Grach is the only plane that has this feature. The other planes tell you in the HUD.
IMO the planes are definitley worth getting, because if you buy FC3 now, you get the F-15C in its full PFM glory, and the Flanker will soon have that and you will be able to upgrade for free.
Also the non clickables are excellent if you just want to move mud in a CAS jet without going through a lengthy startup and tutorials. The A-10A don't forget, is much older avionics wise and does not have the ability to drop PGMs such as the Charlie Warthog, so it's really easy to learn to use.
From your post you said that your favourite DCS aircraft are the modern ASM/PFM and I agree with you entirely, these are my favourite too. But as an owner of all things with the name "DCS," you should definitely give FC3 a shot. If it's not your cup of tea, it will be a blast when EDGE/Nevada comes out and the Su-27 gets its long awaited PFM :)