Allow user to enter amount in a subscription

[tehste]

The alternative is that you can either wait till I can afford to buy another Vbulletin license, domain and hosting. or untill someone else develops this.

Admin Interface: I take it you would just want one subscription type to be a variable amount, but how would you like to set the subscription manager to use the variable donation rather than a price... (and minimum donation etc)
Or would you like hard-coded options rather than an enhancement of the whole subscription system.