Hello Anon
1. are "past perfect + simple conditional" forms allowed too?
In some contexts, e.g. 'If I hadn't killed her puppy, I would stop and talk to her'.
2. If I had the time, I would be talking to her.
Yes, this structure is fine – where it makes sense, of course.
3. If I weren't being afraid of spiders, I would have picked it up
The structure is ok, in certain contexts; though the 'spider' example doesn't really work.
"If you weren't being so annoying today, I'd have paid for your lunch."
MrP