Would it be possible to add filters in the workshop for the elite/optimal items? edit: like for weapons/armour/vehicle or the cities
Unnecessary, IMO. If you wish to find them fast, press CTRL + F (to find things on screen) then search Elite. Though if you go to the correct area, say Las Vegas, you'll see the World Boss stuff from there and other elite/optimal.
if you do bosses for two month for example (all levels) and then want to craft those things into something of use you have to go through the entire list, if there was a filter you'd only have to go through half, and the implementation of such a filter should be no work or challenge at all, so what would be your loss?
If you're doing things for months between checking crafting then chances are you should go through the whole list anyway in case there are things you need to craft, like world boss things or any other craft stuff.. not just elites or optimals. And again, you can easily find things by either filtering by city or using CTRL + F to find on page, 'elite' and 'optimal' and find what you need if you'd prefer to do it that way. Now, what is the loss? The loss is time spent doing one thing necessarily means time not spent doing something else that would add to the game for lots of people.
it would be nice to have a crafting tool where you could enter 1 item and it would show all the things you could build along with showing the other items needed.
It would also be nice to have a 'craft all' button so one doesn't have to find out anything himself and let Kano do all the work.