This may not apply to the OP's needs, but the only problem with setting the long-press time to 100,000 is that the press is still captured by the OS and not passed into the app. Or at least this is the case for the web browser specifically.

I'd like to be able to press-and-hold buttons on a web page (building a web-centric universal remote control) but I can't with the current pseudo-right-click behavior. I've not looked deeply into the massive Opera config files yet to see if it can be totally disabled yet. Ideally I'd like to enable/disable it per site so I can turn it off only for the universal remote, but I bet that'll be pretty difficult. (Wish I could also auto-fullscreen certain sites too actually...)