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Don't know if this helps, but if you want your placed image to be in the corner just record an action:

1. place your file

2. Ctrl/Cmd+A to select all

3. V - Select move tool

4. Align to left

5. Align to top

if you want to align to corner of another layer its the same process but step "2" changes to - Ctrl+Click on the thumbnail of the layer you want align to then choose layer that you want to align in layers panel and follow steps 3-5

this will only help if you want to align to something, otherwise I can write a simple script when I get home.