Could I ask what you were using the delay popup option for? We found most people were setting it to a higher value to avoid the popup appearing and annoying them when they were navigating around the file. We were struggling to find any uses for suggestions popping up after just moving the cursor without typing anything.
It sounds like you have hit an unrelated bug if Prompt isn't capitalizing keywords consistently. Could you provide any more details to help us reproduce this? Is it only on specific keywords/scripts/databases?