thanks Marco,
first I must admit I was ignorant of the "Column Totals" feature. My bad.

The multi-result-tabs feature I have in mind is such that a new, separate,distinct tab with the result grid is create for any single query. AFAIK PLD currently doesn't work like that.
- select 2 SQLs, run, get 2 tabs, then select SQL,run, all current tabs get destroyed.

Maybe check out Toad for SQL (freeware).