Panning two mono tracks left and right will do nothing at all - you still have the mono signal dead-centre, but you've halved the signal level to the L/R summing buss. The buss will like it (less combined signal meaning more headroom), but you've not done anything to help your sound.
2 mono signals will NOT give you stereo - stereo signals HAVE TO be recorded at the source. If you have 2 mono signals and you apply effects/delays to one of them, you get pseudo-stereo or wide mono, but not a real stereo signal.
Pseudo-stereo is used all the time for effect in multi-track recordings, so this is fine, but you have to distinguish between an actual stereo recording and a mono signal electronically processed to simulate a stereo image.
Bruce