papadaca, you just can't wish for something and it come true when dealing with hybridization of capsicum plants...as has been said, it is a long process
IMO you need at least 7 generations of breeding and back crossing to stabalize a hybrid...
just because you plant jalapeno seeds in the same pot as you plant other seeds and they grow next to one another doesn't mean you will get a cross...it probably will produce a cross because of the close proximity of the plants, but you just can't be sure...and if you get a cross, you won't know it until the next grow season because the cross pollination this year will NOT affect the looks/heat/color of the pod. And another thing, you have male and female parts to a flower so you can have the pollen from one plant on the ovary of the other or vice versa and this also makes a difference in what traits the cross exhibit...
Do you understand this?