An update here --
After getting my Pentax K2Q adapter and FW 1.1, I've been playing with flash a bit, and made what I think is a discovery about non-P-TTL flashes
With my Metz 20 C2 (a really nice, inexpensive, little Auto Thyristor/ Manual flash with a tilting reflector for bounce that's pretty size-appropriate for the Q), it will fire wildly inconsistently with shutter speeds 1/200 and over, but when I set the shutter speed to 1/160, it sometimes misses the first shot, then fires and syncs every time (20 shots at least). I would think that this would indicate that 1/160 will fire triggers reliably. The weird thing is that after getting it to fire at 1/160, without turning anything off, I can change the shutter speed to 1/125 and it continues to fire consistently. If I turn either the camera or the flash off, then set the shutter to 1/125, it won't fire. . .so it seems that to use a manual or other non P-TTL flash, you have to first turn the flash off in the menu, then shoot only at 1/160, or at 1/125 only after "priming" the flash first at 1/160. I'd like to see documentation of this in the owner's manual
-- it's really not funny, but I couldn't resist. . .
With non-dedicated flashes and either Q system lenses or the Pentax adapter, the flash menu needs to be set to "off".
Just to review -- the P-TTL options seem to be:
The pop up flash will sync to 1/1000 with the Pentax adapter, but is pretty inconsistent in firing -- I've been getting maybe 25% misfires. P-TTL metering seems to work -- can't make a real conclusion so far. I can actually live with this in a pinch, but it won't be my first choice.
External P-TTL flash seems to work reliably with the Pentax adapter. Flash sync to 1/250. I've only used my Metz 24 AF1 (the P-TTL cousin of the 20 C2 -- same size and features except P-TTL only -- BTW, this is a great bounceable compact external flash to use with Pentax DSLRs for when you don't need a lot of power -- it'll be my family event/party external flash for my K-5 IIs). I've only tried it briefly, but over 20 consecutive shots is a pretty good indication IMO. Again, P-TTL metering seems to work -- but I haven't used it enough for any conclusions.
So now that I seem to have a couple of usable flash options, I'm officially pumped waiting for spring to shoot handheld critter macros. I have all winter to experiment and work out what I want to use. . .
Scott