We have limit 30 request each day for "ask for gift" (or accumulate with "send free gift"). How to max out your Gift Safe House request? You'll get max if all of your request will be responded by your friend. The fact, it's hard to realize, especially if you send request to friends with very big mafia.
But .. there's a simple way to get respond for all of your request (30/day). You can send multiple request to one (yeah .. only one) of your mafia : maybe your another account or it can be your best friend (make a deal with him/her before).
See my previous post about Send Multiple Gift Mystery Bag :
1. Right click and open in new tab your "Get Respect You Deserve"
2. Ask for Gift
3. Select your another account's name
4. Click "Send Mafia Wars Gift Request". Don't click "send" in the pop up windows after step 5
5. Repeat 1,2,3 and 4 till 30 tabs
6. Click "Send" for all tabs