edit: Hold the presses, the data used by "total shoot" display can't be used. It can be the next value, though, if it increases on every exposure.

If you want get_exp_count to return the actual number of taken exposures on your cam (check the list below), I need to know the parameter data number the counter is at. It should be easy to find:
- (optional) place a file named vers.req on SD
- (optional) in play mode press func/set and click disp several times until you see "total shoot" and a number (e.g. 1075, see 1.jpg)
- goto debug menu
- check "show parameter data" (see 2.jpg)
- exit menu
- find the number of total shots (can be quite close what "total shoot" claims; can be way off, as in my case) and make sure it's increased by 1 on every shot and updated without mode changes, the number needed is to the left (e.g. 1 2, see 3.jpg)
(- there's also a counter that's increased by 16 on every exposure, that's used by the current get_exp_count (unreliable in some cases))
(- if necessary, search through several paramsdata pages (debug menu) until found)
- post the parameter data number to this thread/me

~~The number may be 1, but it's better to check...~~
Better use 2...

Parameter data needed for:
a450
a460
a530
a540
a550
a560
a570
a610
a620
a630
a640
a650
a700
~~a710~~
a720
g7
ixus55_sd450
ixus65_sd630
ixus700_sd500
~~ixus70_sd1000~~ (quietschi)
ixus800_sd700
ixus850_sd800
ixus860_sd870
ixus950_sd850
s2is
s3is
~~s5is~~ (DataGhost)
~~tx1~~ (cybercom)