Take a look at the easytaps and stereotaps modules. Both offer parameter access to some of what you’re asking about. I don’t think you can get around a 2000 ms delay in a multitap module (or 660 ms in stereotaps), but it should be possible to string together more than one module to get a greater total delay time.

As a word of caution, it’s easy to get yourself in trouble by adding feedback around a 40 tap delay line, it’s quite easy for delay lines like that to oscillate out of control especially with shorter tap times. What you’ll want to do is use a multiply module from an output (which is your feedback amount), then connect the output of that to an add which also has your incoming signal as an input.

Edit: now that I think about it, you also might want to look at the stereomixer module.