Extra studying doesn’t cheat the SRS system. The scientific literature on this topic was researched by @MegaZeroX They found that extra studying outside the SRS schedule improves retention of items. The trick is to avoid the studying just before a review.
The two best script for studying leeches are in my opinion Leech Training and Item Inspector.. The difference is in how you study the leeches.
- Leech Training will set up a quiz for your leeches.
- Item Inspector will display your leeches in tabular form, You recite the readings and meanings of your items and move the mouve over the item to reveal the answer in a popup.
Item Inspector also has features like export and audio. There is integration with Self Study Quiz to get you quizzed on your leeches. Also Item Inspector is not just for leeches. It can query, filter, sort and display your items in ways that answer various questions about items.
Disclosure: I am the author of Item Inspector.