Currently, the only way to delete transitions is to zoom in and manually, carefully select them, one at a time, while holding SHIFT, and then pressing delete.
It would be far easier to just be able to select clips normally, and then hit one key that only deletes the transitions on those clips, while leaving everything else intact.
Technically, the Palette Gear does have this feature (they put it in at my request) but that's the only way to get it, currently.
This is item #5 in my spreadsheet
https://docs.google.com/spreadsheets/d/1dVJb7kI_ZETLavrplfARgn9gL8HUpvkq6A0jCPxqA3w/edit#gid=1133868...