This was possible in GW1. You could have builds without using elites.
I would like the same feature in GW2, mainly because most elite skills are quite bad.
Example:
http://wiki.guildwars2.com/wiki/Devourer_Venom
vs
http://wiki.guildwars2.com/wiki/Basilisk_Venom
Another on my Ranger
http://wiki.guildwars2.com/wiki/Spike_Trap
vs
http://wiki.guildwars2.com/wiki/Entangle
I would prefer running 4 traps over 3 traps and 1 long cooldown elite which is quite easy to counter as trapper ranger