Topic: Message compose
Hi there,
A good feature to vld is to give your standard members the opportunity to sent xx messages a day.
When the reach the limit of messages the also can send messages by using credits.
After the limit has reached the can choose to sent more by buying credits or wait until the next day.
I think this can be done by a checkbox with the text "use credits"
e.g:
Give them 3 messages a day for free.
If the want to sent more messages the same day the need to use credits.
NO CREDITS ---> NO MESSAGES 
Regards,
Citak