Probably old hat to everybody here, but I recently discovered the scraper blade for a reciprocating saw.
You put the blade in just like a saw blade and the Sawsall turns into a power scraper. In my case, it was just the thing for removing stick-on tile that had a VERY aggressive glue.
You can even sharpen the blade with a grinder or file as needed.
The only downside is the occasional kick-back.
Blades are available at the box stores for less than ten bucks.