Jason (Lee): I think there's a global registry option somewhere governing how long it takes to trigger tap and hold (and the circle animation), but developers are also given control on a per-application basis, depending on how they invoke the API that recognizes the tap&hold gesture. It looks like the guys at Resco opted for a short timing without any animation.
Don: sorry if my last comment sounded harsh... I didn't mean anything bad and I should have probably kept it for myself. If it may help to explain what I meant, and though I understand it may sound hard to believe, I'll just add that I have stumbled in articles where it was very clear that the "reviewer" didn't even know that he/she could "tap and drag" to select multiple items or files... or use the D-Pad while tapping to get a non-contiguous selection of items. 8O
Jason (Dunn): actually holding the action button as a surrogate of tap&hold is something that Microsoft introduced only with 2003/SE. It's not just a guideline to developers. It's something that the OS does on its own. Any application that supports tap&hold to display a context menu will also react automatically to holding the action button. It's the OS that takes care of that, without the developers having to change a single line of code.
As for not being aware of this kind of things, well, most of us are aware of "tap and hold" just because of the "tap and hold" tutorial that's shown when you first power on a Pocket PC (ops. a "Windows Mobile Classic" or "Windows Mobile Professional" device). Considering the increasing attention given by Microsoft to "single handed operation", they should probably revise that tutorial now, and teach how to keep the action button pressed instead.
Cheers!
Agostino
PS: thanks for the note about the avatar policy: the one I had was old anyway, and it didn't reflect my current "look" anymore... The one I have now is much more appropriate.