What should i use to be able to filter items based not on the ID and quantity but on the quantity alone? Lets say that i have RFTools dimlet generator and i want to trash dimlets that i have more than 16. I know about ComputerCraft, but is there anything else?
I am not familiar with the stack sizes etc. of the dimlets as I have not yet played around with RFTools so forgive me if this is totally nuts, but what you describe is basically the item management system I set up with AE in every world.
What you can do is find some kind of containers that hold a quantity you are ok with keeping for the dimlets you get lots of. My mind calls on Storage Drawers 2x2 drawers as some of the smallest ones and easiest interfaced with ME(through its controller). Set up as many as you need and lock them all to each their dimlet(lock empty ones too). Put a storage bus on the Storage Controller and set its Priority to 10.
For all the random ones you probably/perhaps don't get a lot of you can set up an unformatted disc(I prefer in a ME chest so I can easily browse). Set this to Priority 8. You might need more than one if the first one fills up.
To prevent the ones you get a lot of from overflowing and filling up the random disc you put a Storage Bus on a Trash can(I recommend Storage bus->Chest->Trash can), set it to priority 9 and filter in all the ones from the Storage drawers(yes this is a bit of a PITA to do, and you might need more than one storage bus).
This way whenever you fill up a drawer, the rest will get voided. But any new ones will get deposited in the ME chest for you to easily see(and perhaps take out to put in a new Storage drawer).