In general it's a great idea but we have to keep some things in mind: What happens if you load a new sample, or if you manually type a name? It might be pretty useless if you try a few different samples and the instrument sticks to the name of the first sample you loaded. Loading a sample should maybe overwrite the instrument name in some cases but not all: Maybe only when the instrument and sample name are identical?

r14609 implements this in the following way:

If a new sample is loaded, or a sample is renamed manually, the first instrument referring to that sample gets its name updated if:

• The instrument previously had the same name as the sample or it had no name
• The instrument references no other samples

an 1.30 test build will be available soon from https://builds.openmpt.org/builds/