What I've found best for your situation (I had the same issues) is to set the available options as close as possible in 9.0 to what LANDesk is reccomending and creating queries and scheduled tasks for the rest of it.
I have 5 different queries running hourly to pickup machines that fall under mulitple categories. Below is an example of what I've setup for one of them.
Here's a screenshot of my query for machines that have definitions within the last 24 hours but missed their weekly scan (hasn't run within the last 7 days):
Something you should remember is that you can use SQL query commands inside the queries to get verify specific criteria.
For this specific query, I have a task created to update definitions (using the current agent's configuration) and then run a scan (using the current agent's configuration). I have it targeting the above query.
I have 3 seperate copies of this scheduled task due to how long the scans take to run (on average). I have one set at 9am, 12pm, and 3pm. All of these tasks are scheduled to run daily at their specified time.
To make sure my queries are up to date, I have a task scheduled to run an Inventory Scan on each machine in the queries every hour.