I have an annual season for zones 1 and 2, which is loaded onto an
oyster. I use the DLR almost every day.

I do not touch in / touch out when travelling on DLR. Nor do lots of
my fellow (honest) travellers who use the DLR every day.

I frequently have my ticket checked by DLR/tfl inspectors during my
journeys - in fact it happened this morning on my way to work. The
ticket inspectors use one of those portable reader things. I never
get any problem from them. Their machine always gives the green light
- confirming that I have valid ticket for the journey. The irrelevant
detail that I didn't swipe in doesn't bother them at all.