Currently the following isn't allowed:

probe memory_hog = process("alpha").function("allocated_huge") ?
{
  hogger = "alpha";
}

probe memory_hog = process("beta").function("allocated_giant") ?
{
  hogger = "beta";
}

semantic error: duplicate probe point pattern while registering probe alias
memory_hog = process("beta").function("allocated_giant")

You could write it as:

probe memory_hog = process("a").function("alpha") ?,
                   process("beta").function("allocated_giant") ?
{
  hogger = "alpha or beta";
}

But that has two drawbacks. First you cannot easily set the hogger variable.
Second you cannot use this pattern if your tapset is split over multiple files.