First of all, thank you for this plugin. I am relatively new to Obsidian and appreciate the functionality the task plugin provides.
I was wondering if you had considered adding a tag support to the task queries for often-used tag combinations in tasks.
For instance, I could configure the task plugin settings to include 
and:house:
for high-priority home and low-priority home tasks, respectively. Then when I create a task using the Create/Edit Task menu, I can easily choose from these (via a dropdown?) so that the tags are appended to the task and I can query against them.
Examples of emoticon tag combinations and a query:
