In winbox firewall mangle section, instead of having these 3 columns:
- new packet mark
- new routing mark
- new connection mark

Why not have a generic "new mark" column? That is, spend only one column for all of the marks above.
It should be ok as only one type of mark is allowed per rule.

but it's not as perfect when you want to sort by, for example, connection mark only - other marks will bother you =)

Then allow all types. User may choose between use individual columns or generic ones.

The weak point is that it may result a little confusing for users. Any ideas?