Hi Jim,
I don't see a problem with that approach as long as the queries are built like in a pattern like this:
Select ...
from ...
where ...
It is a common approach because Web Intelligence was not able build Data Providers based on free-hand SQL data access all the time, but its predecessor DeskI was. But that connectivity will be available BIP 4.1 SP5 or SP6 . May be it is worth while to wait for that.
If your queries are very similar you can create a big query with all the columns in it and use a subset off the columns in the different tabs. It could save a huge amount of query time. On the other hand it could be vice versa. If the granularity of your queries difer from tab to tab.
Michael