Runway ops
Intersection departures are allowed whilst another aircraft is on the runway but I believe only during daylight hours.
What doesn't backtrack and what does is governed by performance- i.e. the weight of the aircraft and power available and not type. Runway condition and surface wind also is a factor- on wet or slippery runways the stopping distance is increased and this this has to be factored in too.
So a lightly loaded A321 can accept an intersection departure and Monarch frequently will. Heavier aircraft typically going further cannot- - longer Wizz routes, many Easy A320 destinations, longer Ryanair destinations etc.
It may be company policy however not to accept intersection departures - Thomson rarely if ever seem to.