Turns out, WebOS 2.x does support neither AAC nor OGG (I was referring to the Enyo 1.0 SDK before, but apparently that info was only good for WebOS 3.x) but only WAV.
Now I'm not entirely sure what that means for me.
I've never used WAV as an audio resource for background music before, as I was under the impression that:
a) Being uncompressed, files are just way too big for several minutes/hours of music.
b) WAV lacks the concurrency of OGG/AAC.
a) is, in all likeliness, correct but please someone tell me I'm wrong about b) ;)
On another note: Since Construct2 forces me to convert WAV to OGG/AAC, I'll probably have to manually change all audio tags within the app's source. Correct?
EDIT: I just realized something. Apparently, the touch issue is due to the way Construct2 handles touch events. I haven't yet looked into the produced code, but this just became apparent after trying the touch emulation within Construct2.