Is your feature request related to a problem? Please describe.
Trying to tidy up my bags I find loads of items (for example Splintered Sparks of each season, Dreamseeds, ...) that I all need to delete individually. While right clicking a category allows to vendor up tp six items, these items can't be vendored and if the first 6 are non-vendor-able, nothing will get sold until I delete those items manually.

Describe the solution you'd like
If I decide to vendor a category, just delete the items the vendor does not want. Or have this as an option with a very big warning.

Describe alternatives you've considered
Whitelist items for deletion, so when you vendor a category, only previously selected items will be destroyed.

Additional context
This adds a lot to the objective of tidying up the bags as these non-vendorables items are a pain to delete if you have 10+ on a few alts each. Especially when clearing out banks prior to a patch/expansion.

The vendor right-click should skip non-vendorable items now.

Destroying an item takes a click per-item, and is inherently risky, so I won't be adding any kind of automated destroy.